Vag Thumb 

A condition and distinct feeling that follows a full night of thumb insertion into a woman’s vagina or vag hole. The thumb is typically used when dealing with satisfying loose women and/or to replace remaining fingers and avoid strain; also referred to as thumb tendonitis caused by the vag

KB woke up with nasty case of vag thumb after spending the night with that easy hispanic chick he picked up at the bar; he wasnt able to text or update his Bieber fan blog for hours

Vag Thumb by ShawtyValdez September 14, 2010