Green’s Dictionary of Slang

net n.2

(UK milit.) the guard-room.

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[UK]‘Army Slang’ in Regiment 11 Apr. 31/1: The guard-room (prisoners’ room) is [...] the ‘net,’ ‘trap,’ ‘clink,’ ‘dust-hole,’ ‘cage,’ ‘digger,’ ‘dog’s-home, ’ ‘marble-arch’.

SE in slang uses

In phrases

get the net (v.) [the image of the ‘men in white coats’ brandishing a net with which they capture the ‘mad’ person]

a joc., teasing comment aimed at someone whose behaviour is seen as strange or eccentric.

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‘R.C.’/‘Plaid Chad’ ‘The Stalking Post’ 1–2 May at Sorabji.com 🌐 r.c.: Somebody call the guys in the white coats. NOW! plaid chad: <psst R.C.~ you go get the net while I keep chris busy!