chuck one up her

To (prospectively) have penetrative sex with a female.

Possibly of Australian origin, this jocular euphemism for sexual intercourse is typically used by men discussing the attractiveness of a specific (but non-present) woman.

The phrase may be a derivation of the derogatory joke "She's so loose, it was like chucking a chipolata up the high street" in which the male speaker not only slanders the large size of the female subject's vagina, but also disparages the size of his own penis.

"That Helen Mirren's hot for a mature lady."
"Damn right mate, I'd chuck one up her!"

Trap One

As above, trap one, trap two etc. is a method of labelling individual toilet stalls in a row of lavatory cubicles by analogy with racing traps in a greyhound track. Numbering must follow the racing example so looking from the front, the rightmost cubicle is trap one, the one to the left of it is trap two etc so that the numbers read left to right for the 'racers'.

'was that you in trap one this morning? I thought someone had opened fire with a machine gun'

next one up

you know you're going to be next person to be successful in (anything); a feeling of greatness/determination/certainty

Person 1: Hey, you're really good at this.
Person 2: yeah, I'm the next one up

Fill two needs with one deed

To achieve two simultaneous goals with a single action.

A less violent alternative to the phrase 'to kill two birds with one stone'.

I needed to post a letter and buy some bread, so I though I'd fill two needs with one deed and stop at the mailbox on the way to the store.

One-upper

The phrase used to describe the consumption of drugs (particularly MDMA) orally usually in the parachute form done by placing the substance in a small piece of toilet paper or similar material and consuming with a drink usually alcoholic or juice.

I’m probably going to do a one-upper with this M, it lasts way longer.