cock sucking lips. a handy abbreviation which is specially useful when describing someone within cuffing distance who you don't want to know what you are talking about
Sylv: Matt can I have some of your warbutons toastie white bread?
Matt: Yer sure you can Sylv, but it’s mouldy.
Sylv: No problem, do you have any left over pizza crusts instead?
Matt: No csl.
Luke: Grsl.