1. [20C+] imprisonment [the staple morning diet of such establishments in the UK + pun on stir n.1 (1)/SE stir].
2. [1920s+] (Irish) based on SE porridge, a hotch potch.
(a) a confusion, e.g. a traffic jam.
(b) nonsense; usu. as you have your porridge, you are talking nonsense.
see dish out the gravy under dish (out) v.
SE in slang uses
1. a flaccid penis.
2. an impotent man.
[1990s+] the penis.
[late 19C] (Scot.) the mouth.
[late 19C] (Aus. / N.Z.) a Scotsman.
[1990s+] a derog. term for a Scottish person.
[1980s+] (orig. Aus.) to have sexual intercourse with a woman immediately after she has had sex with another man, esp. used of the final man in a gang rape.
[2000s] (N.Z.) to profess complete ignorance of someone.