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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
 
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