Top Definition
A cute and round to overweight creature that roams the Northern hemisphere.
A Welwin was spotted in Vancouver last week.

A mythical mammal; only one exists.
by babybusterbrown December 27, 2011
The greatest most best guy with the wildest dreams. He is really loving, caring, sporty and always there for anyone in need. He always tries to help out but sometimes he is a bit random.
wow bro that guys going to live on mars
no way man welwins crazy
dude hes done it
by 543211234567890 August 19, 2011
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