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1.
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
 
2.
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
 
3.
a man who's tighty whities are so tight that the lines are visible through his sweats; pantylines for men.
girl 1: i saw your crush last night!!
girl 2: OMG how did he look??
girl 1: i mean he had mantylines soo...
by swichee November 14, 2011