(West Country) Friend; mate; buddy.

(obsolete) Hairy; shaggy.

Matted material; rough massed hair, fibres etc. / Coarse shredded tobacco. / A type of rough carpet pile. / (UK, archaic) Bacon or fat, especially if with some remaining hair or bristles.

(dance, sometimes capitalized) A swing dance. / (slang, vulgar) An act of sexual intercourse. / (slang, vulgar) A casual sexual partner.

(Northwestern Ontario) A fundraising dance in honour of a couple engaged to be married.

(transitive) To make hairy or shaggy; to roughen. / (intransitive, obsolete) To hang in shaggy clusters.

(intransitive) To shake, wiggle around. / (UK, Scotland, Ireland, transitive, vulgar slang) To have sexual intercourse with. / (intransitive, vulgar slang) To have sexual intercourse.

Several species of sea birds in the family Phalacrocoracidae (cormorant family), especially the common shag or European shag, Phalacrocorax aristotelis, found on European and African coasts.

present participle of shag

(UK, vulgar, slang) An act (or acts) of sexual intercourse.