くぱくぱ

Meanings

adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'

onomatopoeic or mimetic wordslangvulgar expression or word

Vulgar slang onomatopoeia for the rhythmic opening and closing or pulsing of the vulva or anus. Often used in explicit sexual contexts.

ぱくぱく
ぱくぱく is the standard mimetic for eating quickly or a mouth opening and closing; くぱくぱ is a rare variant, often with a vulgar or niche nuance.
くぱぁ
くぱぁ is a related mimetic for a single opening motion, often used in similar vulgar contexts; くぱくぱ implies repetition.

Onomatopoeic or mimetic word; the exact derivation is uncertain. Possibly a variant of ぱくぱく with a different initial consonant for expressive effect.