げいげい

Etymology 1
Onomatopoeia, in imitation of the sound of someone gagging (compare 🇨🇬), or the sound of someone burping.

Adverb

 * 1)  gaggingly, heavingly
 * 2)  belchingly, burpingly
 * 1)  belchingly, burpingly

Usage notes
Followed by the particle.

Noun

 * 1)  a burp, a belch