A boilermaker is a beer cocktail of a glass of beer and a shot of whiskey. A beertini (beer + martini) is any beer drink that resembles a cocktail. Beer poured into a martini cocktail glass and served with an olive can be considered a “beertini.” A beertini might contain gin, but almost never contains vermouth.
 
The term “beertini” has been cited in print since at least 1998. Other beer concoctions include “beertail” (beer + cocktail) and “beerita” (beer + margarita).
       
 
Google Books
Cheers
Jobson Beverage Alcohol Group
Volume 9
1998
Pg. 197:
Although if someone offers to make you a Beertini, that could be a sign that things have gone too far.
 
Google Groups: alt.tv.real-world
Big Red Shark 
Nov 7 1999, 2:00 am
(...)
I’m still trying to perfect the Beertini.
   
Google Groups: uk.rec.naturist
Driftwood
Feb 2 2001, 7:52 pm
(...)
Somewhere in the States, can’t remember where (Surprise!), I came across Beertinis - like a regular beer, but with something in the bottom of the glass.
 
Maryjanie
WEDNESDAY, NOVEMBER 28, 2007
The Beertini
Beertini Recipe
 
What you’ll need:
 
martini glass
beer
olive
olive juice to taste
 
1. Pour beer in martini glass.
2. Add olive(s).
   
The Arizona Republic (Phoenix, AZ)
Olives in your ‘beertini’ bounce because of carbonation
Sept. 8, 2009 12:00 AM
Today’s question:
My wife likes to have a “beertini,” a draft beer with an olive or two in it. The olives will sink to the bottom, stay there for a bit and then rise to the surface and continue to repeat that cycle over and over. Any idea as to the reason for this?
 
Google Books
Drinkology Beer:
A Book About the Brew
By James Waller
New York, NY: Stewart, Tabori & Chang
2011
Pg. ?:
We are opposed to “cute” neologisms like beertail and beertini, which hurt our eyes, ears, and sensibility.
 
San Dieog (CA) CityBeat
Wednesday, Jan 12, 2011
The rise of the beertini
Bridging the gap between cocktails and beer
By Ian Cheesman
(...)
They come not to bury the Boilermaker, but to evolve it. “What we really wanted to do was to have cocktails where beer was the matrix for all the other really nice, herbal handcrafted ingredients,” Thaheld said.
   
Gastronomista
WEDNESDAY, FEBRUARY 2, 2011
Please Sir, Another Beer-tini
(...)
A few that have us licking our lips:
 
Black Velvet - 1 part Stout, 1 part Champagne
 
Michelada - 6 parts Mexican Beer, 3 parts tomato juice, 1 part lime juice, 2 dashes Worcestershire, 2 dashes tobasco
The Diesel - 1 part Lager, 1 part cider, 1 dash Blackcurrant Cordial

The Snake Bite - 1 part Lager, 1 part Cider
 
(Trademark)
Word Mark BEERTINI
Goods and Services (ABANDONED) IC 032. US 045 046 048. G & S: Beer and beverage
Standard Characters Claimed
Mark Drawing Code (4) STANDARD CHARACTER MARK
Serial Number 78478311
Filing Date September 2, 2004
Current Basis 1B
Original Filing Basis 1B
Owner (APPLICANT) Norman, David A. INDIVIDUAL UNITED STATES 15360 N. 87th Avenue Peoria ARIZONA 85381
Type of Mark TRADEMARK
Register PRINCIPAL
Live/Dead Indicator DEAD
Abandonment Date October 2, 2005