/jp/ - Otaku Culture

What word is カマ here supposed to be? Nothing in the dictionary makes sense.

I don't really want to give context for this scene since it's spoilers, but in case it's necessary - They're talking about whether or not another character is lying about something. Here are the relevant lines:
蛍「――肝試しの時に一度話を聞いてみたが、俺には葛木が嘘をついているようには思えんがな」

奏龍「うん。俺もそう思う」

蛍「ほう、根拠は何だ」

奏龍「一回カマかけてみたけど、声のトーンが全然変わらなかったから」