To have sexual intercourse with the armpit of women. (does not apply to the gays) Generally, copious amounts of lubrication are needed to ease the friction of the erect shaft. The woman in question must have shaved underarms to perform this act with decorum.
A: Why did you fuck that guy last weekend? He was soooo ugly…
B: I dont know man, he smiled at me with his crooked teeth and payed for my drink.
A: Oh my God bitch, youre such a PITYFUCKER!