行ってきます
Ittekimasu ・ イッテキマス
AI translation
Meaning
The call-and-response at the end of a live show.
The closing ritual of live shows that appeared in place of the 手つなぎジャンプ (hand-holding jump), which was done especially up to around 2009.
After the setlist ends and before leaving the stage, TERU shouts 「行ってきまーーーす！」 (“I'm off—!”), and the audience sees him off with 「行ってらっしゃ〜〜い」 (“Take care~~!”).
He started saying it with the meaning “we'll be back again,” because on regional tours they can rarely get to the same place again.
Once 「行ってきます」 took hold, the MC at the first show of a tour came to start more often with 「ただいま」 (“I'm home”).