(idiomatic, chiefly Kansai, slang) to stare or glare in challenge; by extension, to pick a fight

Alternative form of メンチを切る

to get a big surprise; to be astonished

lo and behold

to be astonished, surprised, amazed, startled

mince, minced meat

all of a sudden, all at once

sudden

suddenly

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend