When a guy takes a shit in another guy's mouth, then proceeds to pack the shit down the poor bastard's throat with his dick until he pukes it out for use as anal lube.
Tom: You got something in your teeth bro, it looks like fudge.
Tim: Nah man thats shit still stuck in there from the Dirty Andrew the foreign exchange student gave me last night.
When a man is having sex with a girl in missionary position and is about to pull out and ejaculate on her face, he instead points his penis up and shoots it in his own mouth.
Man I am really regretting that Dirty Andrew last night it tasted like shit!
When doing two girls, and one gives oral after the other gave anal, and you came both times, a dirty Andrew is the cum exchanged between the two girls while they kiss each other.
Last night, I busted a nut so hard in (girl 1)'s ass but then (girl 2) went down on me and I did it again. You should have seen them swapping a dirty Andrew while I nearly passed out.
when you cum in a black women's ass but their ass regurgitates it up and does a splendid cum shot into her mouth. Your wife proceeds to come in and the naked black woman jumps out the window but doesn't die your wife tryes to do a dirty andrew but shes is white so it doesn't work