(idiomatic) Alternative form of rocking horse shit

(idiomatic, vulgar, slang) Something exceedingly rare or, more likely, nonexistent.

(chiefly UK and Ireland, idiomatic, vulgar, simile) Extremely happy; obviously satisfied and carefree.

(vulgar) Synonym of shit-eating grin

plural of shit-eating grin

(idiomatic, vulgar) To lose one's temper. / (idiomatic, vulgar) To have a sudden burst of emotion, regardless of the type of feeling. / (idiomatic, vulgar) To break down in laughter.

(idiomatic) Alternative form of up shit creek

(Australia, slang) With extreme vigour and enthusiasm, where quality may be considered. However, efforts involve high risk, and therefore the potential for adverse outcomes. Vision exceeds regard for due care and consideration.

(Australia, slang, vulgar) Attempting to do something with great difficulty generally with little chance of success.

(vulgar, simile) Extremely stupid.