When one is being given deep throat (hence throat) and at the point of ejaculation unleashes his gear all over the recipients face (cockney rhyming slang for face is boat race). Thus resulting in a bit of throat and boat.
Lee: I copped for some dirty bird last night!!
Ian: Did you get a shag?
Lee: No, but I got a bit of throat and boat...which was rather pleasant!!!
Ian: The dirty bitch!!!
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the action of receiving oral stimulation of the penis, while aboard a vessel at sea.
bro #1 : dude when we went up north last weekend, she gave me boat throat.
bro #2 : bro.
Getting head while driving a boat .
Man I got the best boat throat on the river yesterday.
Super lame awkward guy/super badads awesome guy
"You know paul?"
"I fucking hate paul hes such a throat boat/i fucking love paul hes such a throat boat"