When you cross that line, you've done some stupid ass shit like snitch or whatever and are going to pay for it, maybe with your life. In prison anyone who cross that line is in ad seg.

Made popular again by prison guard turned rapper Rick Ross - Akon
Mf'er snitched on all me, he cross that line.
by Sanity Cruzer April 22, 2011
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When you say something about someone that shouldn't ever be said with them around, not knowing that they're listening nearby, only to respond to you with unexpected anger and fury.
Xbox Kid 1: Yo I heard Mike's Girlfriends armpits were hairy.

Xbox kid 2: Yeah man me too.

Mike: You guys crossed the line, next time I see you guys you're all fucking dead.
by roflwat12 August 31, 2010
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Also known as habitual line stepping. Owning someone so bad that there is actaual pain emotionally or physically to the person and you feel somewhat bad about it.
Dude you just hit me in the eye with a pad lock...comon now, you're crossing the line here.
by Tigbits Magooligan July 12, 2005
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Something one does when temptation becomes too much to handle. Usually done with someone on "The List"(see the list) when it is bad to do so!
So we hooked up last night and crossed the line. Not all the lines! There were some things that we didn't do and lines we didn't cross.
by John September 30, 2003
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To behave in a way that is morally unacceptable.
Alice: Did you hear what Charlie did yesterday?!
Bob: Damn! He really crossed the line this time.
by MalumLibrum958 September 20, 2023
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When one decides it not fun being a good girl all the time, and gives in to sexual temptation. You can still convince yourself it's ok, if you dont cross all lines.
Yeah, I gave in after six years of being a good girl and went for it. Does that make me a bad person?
by donkey September 30, 2003
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v. showering with a man and then putting your mouth around his penis
I can admire a man's penis in the shower, but putting my mouth on it is crossing the line.
by Yiping July 16, 2006
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