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2.
Origin: Slang name for bumhole 'Your Date'

Definition: The line left in your jocks by your date, otherwise known as 'Skidmarks' is your 'Dateline'
"Man, that guys jocks have a bad dateline, I'm glad I'm on this side of it!"
by F.Northy August 18, 2009
 
1.
A take-the-money-and-run online dating agency who cancel your account whenever they feel like it, refuse to answer your e-mails and never refund your money. On-line frauds.
"Dateline have just terminated my account, despite the fact I've paid for another five months of membership yet, and the snotty fuckers won't even answer my e-mails to tell me what is going on".
"Don't worry. Dateline is for Russian immigrants trying to claim citizenship by marrying someone in this country, stuck-up bitches who think only someone with the looks of a film star is good enough for them, and predatory perverts who are only out for what they can get".
by Stormsworder September 12, 2007