It is derived from Wario's name, which is a portmanteau of the japanese adjective warui, meaning bad, and Mario, hence a bad Mario. This would mean that it basically makes "Waluigi" mean a bad Luigi.
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You flip the m in mario up side down to make it wario and you just add a wa to luigi for waluigi.
cause he is dumb (EDIT) uhm, dude meaning that waluigi is dumb doesn't mean he can't be playable in brawl
waluigi wario is his last name
no rosalina does not like waluigi she likes luma and polari!
Wario and Waluigi are brothers. They're the evil opposites of Mario and Luigi.