Another name for a Bounce blower, which is an instrument used to cover up the smell of marijuana while smoking. A happy hoot (HH) is primarily a spent cardboard tube from a roll of toilet paper with sheets of Bounce stuffed inside and another placed over the end (usually held on with an elastic). The smoker blows into the end without the covering, and the smoke comes out smelling less like pot and more like laundry.
Ollie: "I don't want it to stink in her after we sesh, my dad is coming home soon."
Joe: "Don't you have a happy hoot?"
Happy Hoot Man: "Never fear! The happy hoot is here!"