ブサ男 is read as ぶさお (busao) and means ugly man.
ぶさお
busao
おとこ
man
ちょうなん
eldest son (may be the only son)
おおおとこ
big man
さんなん
third son
いちなん
boy
としおとこ
man born in a year with the same Chinese zodiac sign as the current year
やまおとこ
giant
ちゅうねんおとこ
middle-aged man
ちゅうなん
man between 17 and 20 years old (ritsuryō system)
だいのおとこ
adult man
ごなん
fifth son
よんなん
fourth son