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1.
Used as a term for pounds, kilos, stones etc. when describing the weight of a person (or animal if you so desire). Basically it's a word used for general poundage when describing a fatty.
"Dude, I didn't half put on some klem over Christmas, I should have well laid off the gravy"

Or

"She's looking quality these days! I reckon she's lost a few klem!"
by ZEDZDEAD December 22, 2009
24 4
 
2.
A person who becomes confused quickly and often loses track of what their doing.

My old man is such a klem
by Fairf October 02, 2007
16 17