Benny is a very dim character in an old TV soap called "Crossroads" - a name ("Bennies") that politically incorrect UK soldiers gave the Falkland Islanders when Argentia last invaded there.

In the US Benny is a derogatory term used by year-round residents of the Jersey Shore to describe rude, flashy, loud, tourists from northern New Jersey and New York.

Benzedrine is the trade name of the racemic mixture of amphetamine (dl-amphetamine). The drug was often referred to as "bennies" by users and in literature.

Cambridge online dictionaries also give "a sudden period of uncontrolled anger; a tantrum"