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1.
Usain bolt is considered the fastest man in the world. When you get so excited you feel like you could outrun him, you're going usain
man I'm going about to go USAIN!
by tellthemcoppashahahhaha August 23, 2008
 
2.
adj. Quick, quick witted, or first in any contest or pursuit, intellectual or otherwise. Often used by skateboarders in an ironic sense.

......................................................................................
Dude! You are so usain! Flipping air under that Mazda was the bolt!
by gnostic1 August 05, 2012
 
3.
Whenever anything outclasses its rivals beyond description it will be known to have been Usained.

Past tense: When anything has crushed its competition then it is said ‘to have Usained'

Present Tense: If anything is currently smashing its opposition it is 'Usaining it'

Future Tense:
Similarly if something is without a doubt going to outshine its opposition it will 'Usain it'.
Your mum's Rice is nice but my mum's Usained yours.
by Wastecredit manager August 17, 2009
 
4.
'usain' should be used when describing something crazy/out of this world occurs
"That's usain maaaaan.."

"That goal was u-sain"
by Jiggyviggy August 27, 2009