look up any word, like b4nny:
 
2.
a particularly sick individual who is not satisfide with the usual five finger shuffle, and feels it nessecary to penertrate his own rectum with 1,2 or even three fingers whilst beating one off, adding to his own miss guided feeling of sexual gratification.
i was going to have a wank but i thought fuck it why not have a finger bum wank (FBW) i deserve it!
by franklin B wankface May 21, 2006
 
1.
insertion of a finger into the anus whilst "jackin it"
"jeff likes to finger bum wank (FBW) with himself"
by lazycouchpotato7 June 20, 2006