Enough of something to fill a boat, or a boat filled with the thing in question(noun)
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Use "boatful" in a sentence
"They unloaded the boatful of oysters onto the lawn at the side of Charlie's house into two waist high mountains, Jon's and Charlie's, and to the side Jelly's miniscule pile."
"Halfway through the sale, he pointed to a large painting of a boatful of people hanging on the far wall."
"Handguns are not adequate weapons for troops storming a boatful of people who may offer violent resistance, the moreso if those people are armed, even if not armed with firearms."