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1.
Word used to describe someone with a massive penis, usually ranging from 18-43 inches.
"Look at that guy's crotch, he's definitely a Blewitt"
by patrickmcguiness September 15, 2009
 
2.
in a state of disorder (derived from a second hand store in Stirling, Scotland)
The place is (like) blewitt's.
or

Your blewitts (drunk,drugged)
by Frank McChord May 12, 2004