Top Definition
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!
dari dbfsjoe Jum'at, 27 September 2013
Acronym: dat be fair
-So then she took off her shirt.
-Big dbf.
dari Biggus Dickus Sabtu, 08 Januari 2005
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.
dari brysizzle69 Minggu, 15 Mei 2011
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
dari Dreamdandi Sabtu, 15 Januari 2011
Default Bitch Face
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.
dari paperbridge Sabtu, 01 Juni 2013
Designated Bitch Friend
When you're at a party, and that ugly guy won't stop hitting on you, the DBF would say, "dude, she's not into you, walk away." If that doesn't work, you slap that ho.

"Amanda, you're our DBF"
dari roshondalala jones Jum'at, 13 Februari 2015
Dick BoyFriend
My man is such a DBF!
dari koolaidmanig Jum'at, 14 Januari 2011

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