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A prank involving someones head at your crotch level. You stand next to the victim and either quietly or loudly (your preference) start humming the Superman theme. When everyone turns to look at you, it will appear that the victim is performing oral sex on you because they're looking at you also.
"...And then Rob supermanned Greg, and for the rest of the night, easy laughs were had just by humming the superman theme around Greg. Never pass up the opportunity to 'superman' someone."
superman by The REAL Big Danny T September 29, 2008
To love thy neighbor as ones their significant other. After work but before a shower.
Billy Bob: How ya doin

Sally: Hello Top of the Morning to ya (tips her gardening hat at Billy Bob)

Billy: Oh My is that an invitation for a superman

Sally: Billy Bob, What the Fuck! How dare you assume I would superman you so early in the morning before I have my coffe.

Billy Bob: You are right Sally. I'm just anticipating a "hard" day! (wink, wink, cheesy as smile)

Sally: Sorry you'll just have to wait until you get of work. (spanks her ass)

Billy Bob: Fuck you Cunt
superman by JES @ fuck u. com March 27, 2008
A blunt of high-grade marijuana (I like to call it Chronic) laced with cocaine. It's a different feeling from a dirty considering you're smoking coke with really good herb so they call them "Supermans" since it's a lot better.
Yo let's get a eighter and an eightball and roll ourselves some supermans!
superman by emoc December 22, 2004
When riding a horse or motorcycle, hold onto the handles/horse's ears and kick your legs back to resume a horizontal pose with arms in front and legs behind. Keep this up until you hit your neck on a tree branch and become paralysed. After doing this, pretend to care for fellow cripples.

This has been mastered by Christopher Reeve, the actor who played superman in the movies.
I was supermanning on the Kawasaki but managed to duck just in time to avoid the tree.
superman by Kung-Fu Jesus April 16, 2004
Clearly Supergirl's sidekick
Superman, have you gotten ahold of that Lois Lane to be our nanny yet?
Superman by KillerFrost June 9, 2015
The worlds cheapest superhero, Anyone could make him up.
Superman never gets his ass kicked, o i crave a kryptonite bullet!
superman by Fusion September 30, 2003