when a guy's pants are so tight you can see his underwear lines.
I got a face full of manty lines today as I was walking up the crowded subway steps.
by Stephanie Ellis September 11, 2005
The outlines of tighty whities through a mans even tighter pants.
Awwww, sweet Jesus, I can see Jeff's Manty Lines!
by Angry Token Office Guy September 29, 2006