行っていらっしゃい: alternative form of いってらっしゃい (itterasshai)

there's no accounting for taste

see you later (said by a person leaving, a stock phrase required by the Japanese etiquette, lit.: (after) going, I will come back)

run into, hit, strike

carry, take, bring (something)

imperative of 出て行く (deteiku): get out! scram!

a 軍歌 (gunka, “war song”)

(humble) alternative form of いってきます (itte kimasu)

back and forth

(colloquial) Synonym of 行って来ます (itte kimasu, “see you later”)