Meaning

noun the state of affairs that a plan is intended to achieve and that (when achieved) terminates behavior intended to achieve it

noun the place designated as the end (as of a race or journey)

noun game equipment consisting of the place toward which players of a game try to advance a ball or puck in order to score points

origin* (Internet slang sense) Possibly originating with the hashtag #goals. Compare squad goal.

Etymology from Wiktionary, CC BY-SA 3.0