Green’s Dictionary of Slang

see dance on nothing under dance v.

see blow some tunes under blow v.²

(US) to fellate.

1975		T. Berger Sneaky People 305: ‘[P]lay a little tune on my meat whistle. Don’t bite, and maybe I'll slip you a dime’.
2008		D. Fulmer Blue Door 65: He would have shacked up with her in a flophouse. That’s what he really wanted. And not just to [...] play a tune on his meat whistle whenever he felt lonely.

to a substantial extent.

1889

Music Hall & Theatre Rev. 16 Feb. 11/1: ‘[S]ince my arrival [in Australia] I have scooped the boodle to some tune’.