lollapalooza UK /ˌlɒləpəˈluːzə/US /ˌlɑləpəˈluzə/ noun1 •(informal) An outstanding, extreme, or outrageous example of its kind.Here is a novel of low comedy and high raillery. It's a lollapalooza that turns out to be a comic elegy for old-time radio. — 1991 formslollapaloozas