เป็นเจ้าเข้า (pen jâo kâo)

The phrase เป็นเจ้าเข้า (pen jâo kâo) is a graphic sexual slang term in Thai. It literally means "to enter as the master/owner" (เป็นเจ้า = to be the master/owner/lord + เข้า = to enter) and is used vulgarly to refer to acting as the dominant (typically male) penetrative partner in a sexual act, i.e., “to top” or “to fuck (someone) as the one in control.” It is highly explicit, crude, and derogatory, and its use is restricted to very rough, confrontational, or intentionally shocking contexts.