When someone always sucks the fun out of a situation or conversation. Hoover vacuums + Fun = Foover = a Fun vacuum, that sucks the fun out of everything
Goerge: "Dude theres a party with like 27 girls and like 4 guys at my friends house we should really go!!"
Bill: "ok man.. i dont have a ride so pick me up at like 10"
Joe (Foover): "no guys, that is unsafe, we should really stay home tonight."