a girl that's fit but clearly too young to be macked on
Berg: "yo bout to spit at that broad"

Caramel corn: "bro she's like 15, thats some fus!"
by Crookville Zoo April 07, 2009
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The element symbol of Colbertium.
I've got two letters for scientists: Fu! -Stephen Colbert
by BF Torchman April 07, 2011
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Add the prefix "fu" to any word adding the adjectival form of the word "fuck".
It's fu-hot.=It's fucking hot.
Cali's fu-sexy=Cali's fuckin sexy!
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FU can act as an adjective describing units in RTS games. It stands for Fully Upgraded. Mostly seen in forums, rather than in games.
person1: Of course British Lifeguard Hussars beat French Hussars, they are royal guard units ffs.

person2: Not when fully upgraded noob. The French can increase their hand cavalry attack by 15%. That boost means that FU French hussars beat FU British hussars.
by Drüd August 31, 2008
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