male bragging; male conceit
Refers to a man boasting about his own achievements, strength, or qualities. Often used critically.
His stories are always just male bragging, and it's embarrassing to listen to.
bragging about one's husband or male lover
Used when a woman boasts about her husband or boyfriend. Often implies excessive or annoying pride. Compare with 女自慢 (おんなじまん), which is bragging about one's wife or female lover.
See also: 女自慢
I'm fed up with her bragging about her boyfriend. She talks about him all the time.
Compound of 男 (おとこ, 'man') and 自慢 (じまん, 'boasting'). The exact historical derivation is uncertain, but the meaning is transparent from its components.