。
Tell me what it means to be alive.
Literal
Live meaning [object-を] teach-[benefactive-rough-command-てくれ].
A blunt, existential demand. ~てくれ is the rough masculine imperative form of ~てください ('please do X for me') — used between close male peers or by figures demanding something in a rough tone. 教える here means 'tell me, explain,' not 'teach' in the classroom sense. 生きる意味 ('the meaning of living') is a compact philosophical phrase — the verb 生きる functions as an attributive modifying 意味.