Wyatt Earp, n. — Green’s Dictionary of Slang

Wyatt Earp n.

[rhy. sl.; ult. US lawman Wyatt Earp (1848–1929)]

1. the penis [rhy. sl. = kerp n. = backsl. prick n. (1)].

1984

Partridge DSUE (8th edn) 1356/1: [...] 1980.

2. a burp.

2000		personal correspondence: Wyatt Earp – Modern Rhyming Slang for ‘burp.’.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.