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1.
Track marks left by underpants rubbing against a soiled starfish. Similar to skid marks, but lighter brown color. Almost beige. Possibly due to differences in diet from those who produce skid marks. Some studies have been done, but nothing conclusive has been published as this goes to print.
Girl, glancing at the floor- You don't have a hash mark in your boxers.
Fellow-You seem surprised.
Girl- Oh, most of the guys that come in here have them. 19 out of 20, I'd say.
Fellow, puffing out his chest- Well, then, thank you much. Is that what I smelled walked in here?
Girl-No, that's just my upper lip, from the Dirty Sanchez I had for breakfast.
Fellow- I thought you said I was your first!
Girl-Oh, yeah, you're right. I guess I must have just shit myself.
Fellow, relieved- Oh, Thank God!
by Pantaloon January 14, 2008
 
2.
Nickname for a peculiar fancy boy who is dandy in every sense of the word and is a practicing Marxist. This type of life form has been recognized for accumulating the largest charm bracelet collection in this universe. Hobbies include worshipping small trinkets and inviting strangers to squat and unleash volcanic eruptions of fecal matter upon his face. Unsubstantiated claims have been made that he consumes the waste during this process, and that he considers it as important as breathing, if not more.

Source: Corky Spazler
"Hereeeee's hashmark!! I have my toilet seat with me, when I get it over my face you can let 'er rip"
by Corky Spazler December 09, 2006
 
3.
Diagonal stripes sewn to the lower part of the sleeve of a Navy enlisted man or woman's uniform. Each stripe represents four years of service.
You can tell that guy's a lifer by all his hash marks.
by dandi May 28, 2006