to dome up a person is to give him a blowjob. "Dome" refers to the shape of the mouth of the person doming up a guy over the cock of the guy receiving dome. .
Did you hear Shirley domed up Jack at the party last weekend?
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Getting a blowjob. Also known as fellatio.
On a recent tinder date, I got domed up in my car.
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means to suck my ____. as if somone was pissing you off
You know what fool you can just dome me up.
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