The opposite to 'man up'. Used when a friend pussies out of something or if you are persuading someone to back down from a challenge.
Two people argue on facebook:
Dude 1: Shut up or I'll delete your comments
Dude 2: Dude just woman down!
Dude 1: Shut up or I'll delete your comments
Dude 2: Dude just woman down!
by sickguy00000 June 17, 2010