a big jock - Girls’ underpants that look like guys’ jocks, like the ones

Girls’ underpants that look like guys’ jocks, like the ones with buttons or a pocket.

A kid said, "My sister wears jock-style undies, and it’s ridiculous."

At school, a boy shouted, "Why do girls wear jock undies? It’s the worst."

A tweet read: "Girls wear jock undies, and it’s the most uncomfortable thing ever."