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DBFS is an internet abbreviation for "don't be fucking stupid." Its primary use is to admonish someone for a stupid question or their lame behavior.

DBFS is often preceded by a hashtag (regardless of medium): #dbfs
Allison: What are you doing on Sunday night?
Liz: It's Sunday, we're watching "Game of Thrones." DBFS!
Allison: I haven't started watching it. What is it about?
Liz: Winter is coming. Just watch it. DBFS!
by dbfsjoe September 27, 2013
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Jul 31 Word of the Day
(noun) A person who sits on the front porch and intimidates, says negative things, or otherwise makes things unpleasant for those nearby.
The boys walked past the house of old man Thompson, the neighborhood porch dick, who always assumed they were up to no good.
by bigweaseldaddy March 08, 2015
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2
He smiled as he did her doggy style and quickly changed lanes unexpectedly DBF 'ed her (Dry Bum Fuck 'ed her)
by Truthsayer May 12, 2017
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3
Dear Boy-Friend, used by younger girls who hang out on message boards usually frequented by older women who use the term DH (Dear-Husband)
Omg so my DBF and i are tots planning a trip together because we love each other <3 so much
by Dreamdandi January 15, 2011
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5
Designated Butt Finger- The one finger you use for all your butt upkeep needs, scratching an itch, picking out residual poo etc.
Tom: Get your finger out of my face it reeks!

Bryan: Calm down that's just my DBF.
by brysizzle69 May 15, 2011
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6
Barbara: I tried to be nice to everyone in class but Tony just seemed to ignore me ):
Kate: That's because you've got a DBF and no one would walk near you.
by paperbridge June 01, 2013
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