忘乎所以

wànghūsuǒyǐ
  1. to get carried away
  2. to forget oneself

CEDICT

to forget oneself; to lose self-control; beside oneself (typically as a result of one's own behaviour)

Wiktionary

Entry Composition

1 忘 wàng
  1. to forget
  2. to overlook
  3. to neglect
2 乎 hū
  1. (classical particle similar to 於 yú) in
  2. at
  3. from
  4. because
  5. than
  6. (classical final particle similar to 嗎 ma, 吧 ba, 呢 ne, expressing question, doubt or astonishment)
3 所以 suǒyǐ
  1. therefore
  2. as a result
  3. so
  4. the reason why

Related entries

失態 shītài
  1. to forget one's manners
  2. to forget oneself
  3. to lose self-control (in a situation)