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1.
Definition 1 = To leave something, or give up.

Definition 2 = To be sick
Definition 1;
Person 1 = Where is Jay?
Person 2 = Jay spewed the cinemas he had to go and play with his balls

Definition 2;
Person 1 = How was that party last night?
Person 2 = Yeah it was good, Jay fully spewed all over his balls.
by PeterValerio December 22, 2009
 
2.
To get covered in spit by the guy behind you's chew cup when he throws it in the air during a homerun at the ball game.
Ed spewed 3 broads and an old man at the Yankee game Tuesday night!
by Johnny Damon August 29, 2007