What is Finner?
1.
Finner n. (sl.)
Closet Homosexual (male).
John did marry Betty, but we all knew he was a Finner
2.
A variation of the word
Person A: I'm pokin' you with my finner.
Person B: I'll rip your finner off if you keep that up.
See
3.
An insulting name for a person of finnish heritage.
Goddamn finners, taking our jobs.