I was forced to swig down a Dirty Martini without puking out of repect for the person who bought it for me once.
Holding down a Spamtini? Forget about it!!!
A dirty martini is basically all gin, so I can see why that happened to you, especially if you are not normally a drinker.
Maybe if they called it a Spamtini and it was just a gimmick, I could slug it down. But that big cube of Spam in there really churns my stomach.