Prick Relation
Australian slang for a relative that isn't related by blood but only by marriage. i.e. brother in-law, cousin in-law, parents in-laws, basically all in-laws...
Me : " Geez mate that brother in-law of yours is a complete dickhead for getting absolutely pissed as a fart at the BBQ then trying to set the cat on fire. You must be really proud he's family...."
Jono : "Fuck off yer wanker pull your head in he's a Prick Relation...."
Jono : "Fuck off yer wanker pull your head in he's a Prick Relation...."