dusty pelican
A sexual act in which a man engages in anal sex with another man (or woman.) He then ejaculates into said partner's anus, then proceeds to orally remove (aka suck) his semen from his partner's anus. The two then proceed to orally exchange the semen between each other (see snowballing.)
At J. Alexander's, Adam was offered a "dusty pelican" by Cody the waiter.