ones anus. a more casual way of speaking about your butt hole This word is in no way offensive or grotesque, and can be used when addressing people of any generation with no disrespect. It is also away to talk about naughty things without sounding caught so naughty.
sometimes when i am bored i fumble my fum.

damn that fum was so taught.

please don't mind the noises my fum has emitted.
by princessa juanite November 10, 2010
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Word used instead of fuck, when fuck is inappropriate.
by Tacokrom February 9, 2005
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Holy fum!
What the fum?
You lil' fum!
Shut the fum up!
by swine flu htd September 18, 2011
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The act of having so much fun that you accidently type fum trying to explain the amount of fun you are having quickly to get back to the fun
"OMG this party is SO much fum gotta go ttyl:)"
"Talking to you is crazy fum"
by RCRAIDER13 August 20, 2012
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A mixture of cum and fudge. What you get after you blow your load in her ass.
I pulled out my man meat to find it all covered with fum.
by Anonymous June 30, 2003
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adjective: extreme fun. when the word fun just doesn't cut it but you need a replacement for the over-used reserection of awesome

- credit to jac and smil (developed 2005) -
"that NYE party was so fum"
by Bambi_145 December 17, 2007
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