an expression of surprise to an event that is contrary to one's expectations; unexpectedly, to [one's] surprise, contrary to [one's] expectations

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

being from a certain place / coming out

to stand up, to get up / to take action / to recover (from defeat, something painful, etc.) / (sumo) to end warming up (shikiri) and start a match / (computing) to boot

to plan, to aim (to do something)

an interjection of surprise

a rhetorical interrogative; (just) how / expresses a strong denial; not at all, not in the least

sudden

suddenly

all of a sudden, all at once