谷精上腦 [－－－脑]

Jyutping guk1 zing1 soeng5 nou5
Pinyin gǔ jīng shàng nǎo

Definitions (CC-CANTO)
  1. describes a man who is sexually frustrated after being abstained from sex [colloquial]
Definitions (粵典–words.hk)
  1. 語句、粗俗
    同精蟲​上腦
    to be sexually frustrated, to have not had sex in a long time; literally: to have sperm pumping up to the brain
Definitions (Wiktionary)
  1. verb, Cantonese, of a man
    to be sexually frustrated; to become sexually obsessed due to “lack of sperm emission”
    (syn.) 精虫上脑, 精蟲上腦