Ian McLagan, n. — Green’s Dictionary of Slang

Ian McLagan n.

[rhy. sl. = shagging n. (1); ult. English rock musician Ian McLagan (b. 1945)]

(Scot.) sexual intercourse.

2012		(con. 1980s) I. Welsh Skagboys 370: Other cats’ rooftop trysts are right borin, especially if you’re no gittin any Ian McLagan in yirsel.
2015		I. Welsh Decent Ride 115: So the whole day’s taken up wi the Ian McLagan.