Acronym for
junior partier. It is used to describe someone who is
not down for a party or fun time. Someone who
will not partake in fun events, drink more beer, etc.
"Hey James, you
want to see who will have a longer
keg stand?"-Mike
"
Naw dude"-James
"Dude, don't be such a jp."-Mike
"Fine, let's do it"-James