shark biscuit 

Australian slang for a body board (that you lie down on), as opposed to a surfboard (that you stand up on). Derisive term for a body board used by surfboard riders.

She could be a great surfer if only she'd get off that shark biscuit and try a real board.

shark biscuit by BillieBlue November 6, 2013

Shark Biscuit 

1) Aussie slang for a kid at the beach.
For those that require an explanation, understand that some Aussies refer to their children as shark food because they swim in shark infested water.

2) Australian slang for Bodyboarders and inexperienced surfers.

1)
Billy's Mum: Where is Billy?
Billy's Dad: He is swimming in the river inlet.
Billy's Mum: Joe you daft cunt, I fuckin told you not to let him in the river. There have been 3 shark attacks this week in that river.
Billy's Dad: Don't worry he's tough.
Billy's Mum: I'm going to get the Shark Biscuit
Billy's Dad: I need a cold one.

2)
Man 1) Joe is such a shark biscuit, won't even stand up on her board
Man 2) Well at least she is on a surfboard, Terry is on a bodyboard.

Shark Biscuit by WogBoyBogan April 18, 2019

shartbiscuit 

(1) A tiny turd you find in your underwear or lodged in the crack of your bum after a shart, or dodgy fart.

(2) Someone who acts like a bit of a turd.

"Damn! That's the third pair of undies I've lost to shartbiscuits since I became a vegetarian!"

"That shartbiscuit Tony always uses all of the milk but never goes to buy it."

shartbiscuit by fran_kato March 6, 2014

Shart my biscuits 

A fart where some poop comes out that also hits your testicles.

Im so drunk I might shart my biscuits.

Shart my biscuits by Picklefla4 August 27, 2021