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1.
Much like whiskey dick, but in this case it is when you lose your hard-on while railing some chick because she wont take her top off during sex.
I am tired of rocking on top of you with your shirt on. I have nothing to look at, you are giving me major sweater dick.
by EddieTheNet April 23, 2009
 
2.
Another term for an uncircumsized penis
Chick #1: "ugh i found out last night my boyfriend is uncircumsized."

Chick #2: "Oh, he has a sweater dick?"
by Cassiegurl June 26, 2009