Is flooded a verb

It can be... but only when not pertaining to humans.

Sally said," I flooded myself" could not be found in any type of slang and so only pertains to sources of water and others.

Ex. "The waterfall flooded the canyon because of the dam breaking," said the dam operator.

Flood can also be a noun in the proper tense and can also be a proper noun as it is references to biblical passages.

Ex. "The Flood had lasted for 7 days and 7 nights."