You've got some nerve — you dare to talk back to the boss?
Tips
memory
Literally 'gallbladder big enough to wrap up the sky' — Chinese tradition locates courage in the 胆 (gallbladder), so a sky-sized one means fearless to the point of recklessness. Usually carries a critical or sarcastic tone.
register
Strong negative connotation — accuses someone of being foolhardy or insolent, not bravely heroic. For positive courage, use 勇敢 (yǒnggǎn) or 英勇 (yīngyǒng) instead.