Green’s Dictionary of Slang

goola n.1

[Ital. culo, the anus]

(US) the anus; the buttocks.

[US]R. Mende Spit and the Stars 175: Ha! Ha! Up your goola, Mr. Bick.
[US]‘Troy Conway’ Cunning Linguist (1973) 135: Magda turned away and I looked longingly after her, seeing that gorgeous goola I remembered so fondly and so well.