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

(vulgar, simile) Extremely stupid.

(vulgar) Synonym of give a shit

(slang, vulgar, idiomatic) To ruin one's day.

plural of shit-eating smile

(idiomatic, vulgar) To be well-informed concerning a particular subject; to have a capable command of a particular area of expertise.

(slang, vulgar) Synonym of all mouth and trousers

(simile, vulgar, derogatory) In very close proximity; following closely.

(vulgar, colloquial) An expression of astonishment or disbelief.

(colloquial, vulgar) Problems originating at the top of the chain of command or organizational hierarchy tend to become the responsibilities of those lower down.