shag vs roll in the hay

shag and roll in the hay both are nouns.

Word	Noun	Adjective	Verb	Adverb
shag	Yes	No	Yes	No
roll in the hay	Yes	No	Yes	No

As nouns, shag and roll in the hay are synonyms defined as:

Other synonyms of shag include ass, fuck, fucking, nookie, nooky, piece of ass, piece of tail, screw, screwing, shtup.

shag (noun)	roll in the hay (noun)
a lively dance step consisting of hopping on each foot in turn	slang for sexual intercourse
slang for sexual intercourse
a fabric with long coarse nap
a matted tangle of hair or fiber
a strong coarse tobacco that has been shredded

shag (verb)	roll in the hay (verb)
dance the shag	have sexual intercourse with