Amharic

ḳʷǝḳḳ alä - to break winds almost imperceptibly, to let a series of farts, to make a noise in vomiting (AED 761)

Note reduplication in the quasi-verbal element ḳʷǝḳḳ.

PS
*ḳy/wˀ - to vomit (SED I No. 39ᵥ; Kogan 2011: 231)