adverb, adverb taking the 'to' particle
Mimetic adverb describing a clean, sharp breaking or snapping sound or action. Often used with 折れる or 切れる.
See also: ぽきっと
枝がぽっきり折れた。
The branch snapped cleanly.
suffix
Suffix-like use after a number or amount, meaning 'exactly that much and no more'. Similar to こっきり. Often used with だけ or しか.
See also: こっきり
千円ぽっきりしか持っていない。
I have only exactly 1,000 yen.
Mimetic word; the exact derivation is uncertain, but it is likely related to the sound-symbolic root ぽき (pokipoki) representing a light snapping sound.