Green’s Dictionary of Slang

Lionel (Bart) n.

[rhy. sl. = fart n. (1); ult. UK composer and lyricist Lionel Bart (1930–99)]

breaking wind.

1998		R. Puxley Fresh Rabbit.
2003		B. Dark Dirty Cockney Rhy. Sl. 75: It’s a well-known fact that everyone likes the smell of their own Lionels.