means "dead fish". He was saying don't do anything and let seme take the lead. Just lie down like a dead person and enjoy
Thank you for the clarification! (●'◡'●)ﾉ
Lol. I was gonna ask the same thing. What's with the tuna? Haha. Thanks @junki for explaining.
It can also have negative meaning if the speaker is insulting someone. Tuna or dead fishes are associated with virgins as they won't know what to do during their first time.
Finally! Hot, but....how is a Tuna supposed to act? If my life depended on acting like a Tuna I'd most definitely die 'cause I'd have no idea how to go about it.... ╮(￣▽￣)╭