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An exciting, trending dance move involving two men in which they hold their foreheads against each other and wildly thrash their arms and legs in a frenzy of pure hyperactive bromance.

Typically a manthrash is initiated through the subtle thrashing of one man until another man notices. It is common courtesy to immediately begin manthrashing with a man who is noticeably solo thrashing.
Wow, look at Tommy manthrash with Matt! They're so good at manthrashing together.
manthrash by Emtrix October 22, 2014
Related Words
A player-character who is a male in real life, but plays a female cat character (mithra) in Final Fantasy XI.
person a: hey, what's up sexy kitty?

person b: um, i'm a manthra...

person a: ...

manthrax 

A common modernised nickname for Manflu
Where is Dave today?
He's at home, manthrax!
manthrax by Psyduckzilla January 15, 2012

Manthrax 

The derogatory term for the man in a womans life that she can't seem to get rid of even though he is slowly choking the life out of her
1. He is my manthrax, I just can't seem to leave
Manthrax by Sick of Johnnys October 23, 2007

manthrax 

Wait a minute... this isn't anthrax, it's MANTHRAX :O*********
manthrax by Nobuyuki September 18, 2004

Mantrhax 

A man with life is a constant war, to not kill everyone else in the world, he thinks thats the mankind is a virus and they must be eliminated so earth can survive this holocaust.
Look, its Mantrhax, run for your lives !!!
Mantrhax by Mantrhax October 12, 2009