erect nipples visible through clothing
Slang term referring to the outline or protrusion of erect nipples seen through a shirt or other clothing. Often used in casual or online contexts.
Be careful with thin T-shirts because your erect nipples might show through.
I noticed her nipples were visible through her clothes and felt a bit embarrassed.
Compound of 胸 (chest) and ポチ, an onomatopoeic element suggesting a small, protruding dot. The exact origin is uncertain, but it likely emerged in internet slang.