Eating another person's ass to provide sexual pleasure. Usually a result of a large chemical or alcohol intake that leaves you feeling so wild and horny you just wanna do EVERYTHING.
I came home from that kegger and I was so blotto I think I performed rumpilingus on my girl.
or
On prom night, we did everything shy of rumpilingus.
or
On prom night, we did everything shy of rumpilingus.
by Nick February 9, 2005
Get the Rumpilingusmug.