Banterogenic 

Specifically, a substance (typically alcohol) which, when consumed will make a person banterogenous and will cause banterous behaviour.

"Dave drank so many 'banterogenics' last night, his banterous behaviour became almost unbearable."

Synonyms:
Banterogen
Banterogenous

(i.e. a banterogen is a 'banterogenic' substance which is banterogenous and will cause banterous behaviour)

Banterogenic by SpazyMcGee February 8, 2015

Banterogenous 

A consumable substance which causes banter to occur between two or more people.
-or-
A person or people who have banterous intentions or are inclined to cause banter between one another.

"This weed is particularly 'banterogenous'."
-or-
"Drinking large quantities of alcohol makes me and the lads extremely 'banterogenous'."

Banterogenous by SpazyMcGee February 8, 2015

Banterogen

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

Banterogen by SpazyMcGee February 8, 2015