adverb, adverb taking the 'to' particle
Mimetic word describing a rounded, protruding shape, especially a belly or a small bulge. Often used with お腹 (stomach) or similar body parts.
食べ過ぎてお腹がぽっこり出てしまった。
I ate too much and my stomach is bulging out.
その袋
The bag was bulging with its contents.