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1.
An insult for Some guy who was poor enough to be born with no dick so has to use a rubber dildo as a cock and sew it on.

An insult for someone who has no dick
John: "Hey Robert, how you doing?"
Robert: "Shut up Sew-On"
by LOLjokeGUY May 05, 2011
 
2.
Someone who won a sewing contest... a sew won...sewon ;P
Bill: I wonder who will be this year's sewing contest Sewon!
Bob: Probably the same Sewon that it has been every year.
by William cool October 26, 2014