From Wiktionary, the free dictionary
Compare Chinese 你個頭 / 你个头 (nǐ gè tóu), Malay kepala otak kau.
your head
- (Singlish, Manglish) My foot, my ass (a dismissive response to someone's remark)
Working after school hours part of 'service'? Your head lah.[1]
2009, Jean Tay, Boom, Epigram Books, →ISBN, Act I, scene xvii, page 64:young father: […] If things work out this time, I tell you, you are going to live like a queen. […]
young mother: […] Queen your head.
- ^ Headline of mrbrown article[1], October 10, 2016.