What is Happy-hoot?
1.
Another term for a Bounce-blower, which is a simple device used for masking the smell of marijuana.  Essentially, it is a bare toilet-paper roll with a laundry sheet held over one end with an elastic and other laundry sheets stuffed inside.  To use, one simply takes a hit (off a 
Joe: "Hey man, what happened to the happy-hoot?!"
Elliot: "Oh my God, I sat on it!"
Mitch: "
Pwned !"
See 
2.
Another name for a Bounce-blower, which is a device used to cover up the scent of 
Worried that his parents would find out he smoked pot, Alex secretly made a happy-hoot for his enjoyment.
See