When you have a tongue ring/tongue stud and you lick another person's asshole thus creating the look of an old rusty dumbbell.
Holy crap dude, I haven't rimmed a girl since I got this new tongue ring, but last night I went to town on my girlfriend's sister and totally got a rusty dumbbell.
by Snickersburton September 11, 2007
Get the Rusty Dumbbellmug.