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1.
Inserting one's finger into, 95% of the time...an area where it does not belong.
Bob: Hey man I heard you fingerbanged my girlfriend last night!?

Jack: Nah man, it was your grandmother
by Billy Mays' Receptionist January 29, 2010
 
2.
a musical term. mainly found in hip hop. reffering to musicians and artists that do they majority of their work by banging they fingers on their keyboards pushing their protools around.
those hooks are tight but he was up all night, he finger banged them out in his grammas basement. he fingerbanged so hard almost knocked his protools off sequence.
by j3p March 21, 2008