In Cantonese (Chinese dialect) it literally means $10. The word comes from the act of a transvesititute/dancing nancy giving a BJ as it is the market price charged and also because it sounds similarly to "suck cock".

More commonly known to just mean the act of giving/receiving a BJ /blowjob/blow job.

Can also be used as:
The term to say when you're not giving a fuck.

Pronouced: SUP KA-OW
1. "I wonder what's taking Benny and Joane so long..."

"Sap Kao!"

2. "How was your hot date last night, dude?"

"SAP KAO, MAN!!"

3. "How was your test yesterday?"

"I slept throughout the test... sap kao, man!"
by CorpseOnAir October 13, 2011

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