a boy who is hair colored compatible with a girl he likes and/or is dating.

When someone sneaks up behind you you and pulls your keks down

Drinking exponentially large amounts of beer inverted on a keg.

Can describe someone with a bit of extra timber - ‘she’s a bit keggy.’

‘She is well keggy’ could also be used to describe someone who is fucking massive. Some may also say ‘the full barrel.’