[in combination]
informal inclined to use a specified thing excessively or at random:
trigger-happy.
Phrase
(as)
happy as a sandboy
(or Brit.Larry or N. Amer.a clam)
extremely happy.
[prob. orig. denoting a boy hawking sand for sale.]
happy hunting ground a place where success or enjoyment is obtained.
[orig. referring to the optimistic hope of Amer. Indians for good hunting grounds in the afterlife.]
John: How’s your trip to Tainan?
Jenny: ____________ I tried local snacks and visited some museums.
John: I guess you’re pretty happy about your trip.
Jenny: You bet!