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When a friend of yours does something stupid or funny yet uncalled for , there by making the situation funny. Your friend must extend his hand , and you must slap either gently or hard. Note if you slap it harder then required then thats hands on you and he can slap your hand.
Tim: dam look at that gurl she looks so good ;)
Bret: dude thats ma ex that i just broke up with , thats hands man
Tim: alright (extends his hand)
Bret:(slaps hand)

They then laugh about stupid shit and if somethen stupid gets said thats hands
by Willfredson of your mom August 13, 2012
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When someone says something ridiculously stupid another person can call out "hands" and gets to slap their hand.
B is the last number of the alphabet
(Another person) that's hands
by Piece of buttocks February 14, 2017
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