plural of Sir

(obsolete, colloquial) A priest.

plural of Sir John

(military, slang) The act of beginning and ending a sentence with the address sir.

plural of sir sandwich

(Internet slang) Used to indicate that one finds a statement to be bizarre, tangential, or inappropriate for the context in which it is made.

(Internet slang) Alternative form of sir, this is an Arby's.

(archaic) excrement

(archaic) Used apologetically when something offensive is mentioned.

(dated) Used as the salutation at the beginning of a formal letter when addressing persons – assumed to be male – of unknown names.