Green’s Dictionary of Slang

cock on! excl.

(UK juv.) fine, good, agreed.

OnLine Dict. of Playground Sl. 🌐 cock-on n. A ‘catch all’ phrase that encompasses a range of meanings. Can be used in the same context as ‘Right on’, e.g. ‘Cock on man, I know what you mean’. It can be used in the same context as ‘Rock on’, e.g. ‘cock on, I’ll catch you later’.