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knuckle fucked in the cock sucker 

When someone is about to get their lights punched out directly
"He about got knuckle fucked in the cock sucker after he said that scandalous shit"

knucklefucker 

A man who masterbates
John knuclefucked himself before he went to sleep.
knucklefucker by Dan March 2, 2005

knucklefucker 5000 

A dildo, preferably large and black attached to some rubber (or brass if you're that hardcore) knuckles.
"Man you should have scene that crazy bitch's closet. It was full of knucklefucker 5000's !!