GOTCHA

Etymology 1

Contraction

gotcha

(colloquial) Got you; have you; as in capture or apprehend.

(colloquial) Understand you; comprehend you.

(colloquial) Got you covered, got your back; when you have an advantage or responsibility over someone.

(colloquial) Got you back; as in after causing some form of retaliation or revenge against someone.

(colloquial) Got you by surprise; exclamation indicating a successful trick or prank.

Etymology 2

Direct acquisition of gotcha, the contraction of got you.

Noun

gotcha (plural gotchas)

(colloquial) A potential problem or source of trouble.

(colloquial) An instance of publicly tricking someone or exposing them to ridicule, especially by means of an elaborate deception.

(colloquial) An instance of accomplishing a tricky idea or overcoming a difficult obstacle.

(computing) a feature of a system or a program that works in the way it is documented but is counter-intuitive and almost invites mistake or non-function.

Source: Wiktionary