Top Definition
short for

Radical Fuck
1. a person who is outrageously radical.
2. a person that is so rad.

or

Radical Fucking
1. great sexual intercourse.
Radical Fuck
Damn Tony Hawk is one radfuk.

Radical Fucking
Last night I had the most radfuk I ever had in my life.
by siddhartha October 19, 2004

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