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1.
To flirtatiously rub the belly button of a friend or potential lover for the purpose of touching them or making them laugh.
Annie: I'm not ticklish, don't even try.
Ted: How about thrubbing?
Annie: What's that?
Ted: -thrubs-
Annie: WTF THATS SO WEIRD
Ted: >:)
by Zelmung October 02, 2011
 
2.
The area of skin between the thumb and forefinger.
My gloves have developed gaping holes in the thrubs.
by Kit Peters December 15, 2004