The act of two males standing back to back with a dildo in eachothers assholes. Similar to scissoring but in a homosexual way. If u look closely it looks like a dumbbell ready to hold by the handle and lift up over ur head and rip those gays a new one.
Today I saw my daddy and my other daddy doing the dumbbell in my bedroom with my sissy dildo.
by Dumbbell December 15, 2014
someone who denies they like pot and bums around all the time with nothing else better to do.
"I'm a dumbbell, I've watched anime all day."
by s**g October 22, 2008