New Zealand Nuke

Holding in a large shit for the longest time possible and then running to the closest person bending them over and excreting in their asshole giving them a warm and tingly sensation. Only in New Zealand

Stu: Yo i gave my wife a New Zealand nuke last night!
Brendan: No way me too and she loved it

Bum Beard

The filthy mess where scat gathers in under your asshole ready to be eaten

Will: Hey Ewan where is Ollie? He needs to play squads
Ewan: He's probably eating Kendall's bum beard again
Taine: That's straight bars! Chocolate ones