Green’s Dictionary of Slang

1. to shout.

1939

Wodehouse Uncle Fred in the Springtime 17: They started yodelling to The Subject, evidently inviting her to step along and have one.

2. (Aus./N.Z.) to vomit; often in ext. phrs.

1963–74		B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 100: Some dirty bastard [...] just yodelled on the wall-to-wall.
1971		F.J. Hardy Outcasts of Foolgarah (1975) 204: Crooked Bed McCracken signed the chunderer up as a professional [...] and the Champion Chunderer yodelled in technicolor at the Darwin show.
1988		McGill Dict. of Kiwi Sl. 127/2: yodel over the mahogany to vomit.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

3. (US) to swallow.

2021

J. Ellroy Widespread Panic 204: [H]e yanked the cap and yodeled a big blast.