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2.
When 2 male teenagers hump and/or "dirty dance" on another person's legs.
They party-boi'd him when he walked past us!
by Morticia March 13, 2005
 
1.
To do a copycat and/or an even stupider dance than the person infront of you who is unaware you are mocking them at advance levels.
'You got partyboied'
'Go partyboi him'
by lyrarose5 August 16, 2009