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Two different meanings:

A: Some gadgetry in Halo 3 that throws a player either high up or far out into the distance, only to be sniped, skeet shot, or a battle rifle massage in the back when he or she lands.

B: A bunch of jocks that take a scrawny or morbidly obese high school student, one holds each arm, then they sling the 'ammo' into a crowd or another scrawny kid or morbidly obese person at terminal velocity. Side effects to mancannoning someone can include, but is not limited to, temporary paralysis, permanent paralysis, eating concrete or other terrain, fractures, sprains, death, fights, embarrassment, disciplinary action, and commonly, unexpected gas.
A: LOLOLZ I MANCANNOND AND LANDED ON A TRIPINE IT WENT BOOM HEADSHOT FTW LOLFFFFFF.

B: I mancannoned Ned into fatty just now. It was funny until we found out he had to get his face reconstructed in plastic surgery.
Mancannon by Pr1nc3 A1b3rt February 18, 2008
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man cannon 

Draw your meat swords and arm your man cannon!
man cannon by EddyGaluszka September 12, 2004

man-manfanning

Man-manfanning, not to be confused with woman-manfanning, is when a man twerks on another man's dick while spreading his asshole to approximately 8 inches in diameter. (Penetration is optional.)
Phillip Theodore II and Aydyen were totally man-manfanning each other the other night.......fags.
man-manfanning by dingusmcstinkus03 September 26, 2022

Mancation 

The most ultimate man-only vacation. Usually this trip involves heavy drinking, getting kicked out of something, and nearly dying. At camp sites, everybody who is not a mancationer hates the mancationers, likely because they can not understand the sheer awesomeness that is Mancation.
JD: Hey Big Steve, you going to the Mancation this year? It's going to be awesome!

Big Steve: I don't think so, last time I went I got too drunk and started eating Tums like candy. I shat a rainbow the next day!

JD: What's your point?
Mancation by JDFERNS October 18, 2011

bancannon 

An extremely versatile weapon used by power administrators to keep the forums free of trolls. It is much stronger than a feebly banhammer, and its awesomeness is so great it has even been ported to games
Then he shot them all with the bancannon
bancannon by Urmom_urdad September 27, 2007

mancation 

When normal males engage in "guy" activities that involve sports, camping, gambling, chasing women and most of all drinking amongst their all and only male friends. No wives, mistresses or girlfiends allowed. Done in order ot get in touch with their male-primal roots.
Jack and I hiked 25 miles to trout fish in the Sierras. With many beers and stories, it made for the perfect Mancation.
mancation by Jack7559 April 28, 2006

Manpanion 

A male friend with whom another person spends large amounts of time. Describing someone as your "manpanion" does not imply that any sort of sexual activity takes place.

A man who is your companion.
Girl: You spend so much time with Frank, its like he's your boyfriend
Guy: Relax baby, we just enjoy playing video games. He's my manpanion.
Manpanion by Rugger X August 29, 2007