Pre-swall 

A gathering of people who meet up before they go on a night out to drink as much alcohol as possible.

This is usually done by students to save money. It also adds a bit more to the night and there can even be an after-swall on special occasions.

Chrissy - yo mate you going out tonight?
Ben - yeah i think so are having a pre-swall?

Chrissy - yeah pre-swall at mine at 8 oclock.
Ben - Okay, see you then, let's get fucked!

Pre-swall by millheadmate May 13, 2010

pre-cough swallow

Refers to where you feel a cough coming on while your mouth is full of food/drink, and so you hastily down the entire mouthful so that your mouth and throat will be free to expel the cough "cleanly", rather than there being a humongous "geyser" of messy stuff to go flying all over the place and disgustingly splattering everything within a several-foot radius.

I'd just swallowed a big bite of spicy-hot chili and was in the process of washing it down with a swig of cold milk when I felt an overpowering urge to choke, so I did a hasty pre-cough swallow to avoid a spluttery shower of tomato-tinted milk all over my new tablecloth.

pre-cough swallow by QuacksO August 1, 2018