Green’s Dictionary of Slang

Raquel Welch n.

[rhy. sl.; ult. film star Raquel Welch (b.1940)]

a belch.

[US]Maledicta II:1+2 (Summer/Winter) 120: The Telegraph author [...] doesn’t seem to recognize the American origin of George Raft (‘draught’), Mickey Mouse (‘house’), Raquel Welch (‘belch’), and so on.
[UK]B. Kirkpatrick Wicked Cockney Rhy. Sl.