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1.
Somebody who, over regular methods of rehydration, would prefer to gently suck the hairs from beneath the arm, leading to a smelly, but refreshing, drink!
Are you an Armpit Sucker?
by Billy No Legs April 09, 2003
 
2.
Someone with bad taste
"Dude, I'll give you this deep fried mars bar if you go and pull Mary the Armpit Sucker."
by Soiled Undergarment July 09, 2003