106th base is when you have sex in an elevator with your mums dog whilst your ex ex ex girlfriend is licking your anus and a goat it shuving his dick up your nose
dude 1: you will never guess what!?
dude 2: what?
dude 1: i got to 106th base last night, it just happened when i got in the elevator coming home from work
dude 2: ew man! seriously you let a goat shuv his furry dick up your nose?!