lag, n.¹ — Green’s Dictionary of Slang

lag n.¹

[? OF l’aige/l’aigue, water]

1. a bundle of clothes; always as lag of duds n.

2. weak liquor or wine.

1984

Partridge DSUE (8th edn) 662/2: late C.16–19.

3. urine.

1610

Rowlands Martin Mark-all E3: Lagge, water or pisse .

4. an act of urination.

2009		R. Milward Ten Storey Love Song 137: ‘I’m dying for a lag’.
2023		R. Milward Man-Eating Typewriter 37: [S]truggling to enjoy a relaxing lag or caca.

5. see lage n.

take a lag in (v.)

(W.I.) in fig. use, to abuse, lit to urinate on, thus cognate with piss on v. (1)

1975

S. Selvon Moses Ascending (1984) 45: When the communication media tired lambasting the Blacks and the Paddies, they take a lag in Paki arse.