Designated Sober Friend.

That one friend who doesn't drink or smoke at all, but comes with you to all the parties. Sometimes they might get made fun of, but you can always depend on them to get you home.
"Hey, wanna hit up Delta Upsilon tonight?"
"Sure! I'll grab Katie, she's a great DSF."
by KernelCore October 1, 2014
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AKA Dungloe Street Fighters.

Group of youths who terrorize the small, usually peaceful village of Dungloe in Co. Donegal.

Well known locally for their unforgiving Mafia style leaders, the DSF regularly steal from The Cope and have been the main reason why Dungloe haven't won the Tidy Towns this last few years.
Did ya see that flower pot dug up in yer wan's garden?

Aye, the fucking DSF are at it again >:(
by Concerned Local November 7, 2010
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Dick Sucking Face. The face you make when you suck dick. A play off of DSL (Dick Sucking Lips)
"She has a pretty hot DSF"
by pookie5435 November 3, 2011
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"Hey bro, what do you wanna do tonight?
-DSF!
-Right on!"
by Myriam and Pat June 28, 2010
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Tanfan and Trevor are totally DSFing on the RCMB!
by ChadHennesTailBone October 10, 2005
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dead sexy female, perfect girlfriend material. hustler of men
dear DSF, thanks for being the greatest girlfriend ever.
by lola nicola June 17, 2007
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Drunken Step-Father
I gor beat up by my DSF!
by MickC September 19, 2008
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