To hurriedly wash yourself, usually in one area of your body, in a sink in a way that you'd usually do in a shower or bath.
You could shampoo your hair, wash your feet, or anything in between.
It's often, but not always, done secretly in desperation: there's no time to shower or bathe, or you don't have access to a shower or bath, like at work.
"Oh, man, you're just too funky. Sink wash your junk and come and fuck me."
"You having a bad hair or what? You're gonna have to sink wash your hair before the meeting."
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the act of washing your genitals in the sink before having relations with a special friend.
the act professinal persons aka ladys of the night will ask you to perform pre coutus
guy 1: my girlfriend made me have a cheeky sink wash before we got started.
guy 2: standard mate. id make you have one to
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