Noun
Typically a substance, (usually alcohol) which, when consumed
will make a person banterogenous and
will cause them to execute banterous behaviour.
Can also refer to a person who, as part of group of lads
will be the dedicated 'banterogen' - A person who will nearly always be the one to begin a banterous conversation.
"Dave
drank so many 'banterogens' last
night, his banterous behaviour became
almost unbearable."
-or-
"Dave is such a 'banterogen'! He always makes the lads giggle