A dirty ally is someone who is aggressive and can leave you without being able to catch your breath. Her ride game is amazing.

A dirty ally is when someone’s significant other pores hot wax on their nipples

A "dirty Allie" is when a female is getting oral sex and right when she is about to cum she all of a sudden drags your face into her ass while she farts into your mouth and then licks your mouth right after. That is a Dirty Allie.