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originated from the msn abbreviation - ROFL (rolling on floor laughing)
a drunk girl at a party decided to literally roll on the floor laughing however there wasnt enough room to roll so she swayed.

then some other person shouted "your swaying, its a SWOFL!!!"

and so.. swofl was born.
stands for - swaying on the floor laughing
"dude that joke was so funny, i swofled!!"
by Ozzswofl October 12, 2009
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