gotcha

(colloquial)I understand you or what you said.

Gotcha! You just want me to stay here for now.

Verstanden

(colloquial)I got you by surprise (indicating a successful trick or prank).

Gotcha! You never noticed the whoopie cushion!

hab dich, erwischt

попа́лся!popálsja!, попа́лась!popálasʹ!, попа́лись!popálisʹ!

(colloquial)I caught (uncovered) you (as when successfully bringing someone to reckoning or effecting some form of retribution).

Gotcha! What do you think you're doing, sneaking around in here?

(colloquial)I have caught you (literally, physically) (said by a speaker who has physically caught someone or something that was falling).

Gotcha!

(colloquial)I have got you covered, I've got your back (said by a speaker who has an advantage or responsibility over someone).

Gotcha! Go on in...