Top definition
the numb feeling in ones thumb that ocurrs from holding a cold item for too long
I got some killer polar thumb from that Ben and Jerry's yesterday.
by Johnny Tats March 24, 2008
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When you unintentionally get cum on your thumb post-masturbation
"Jerry's smile turned to a frown when he looked down at a polar thumb. He quickly got toilet paper to clean off the mess."
by ckfits April 02, 2017
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