|2.||happy as a clam|
to hate the environment and smile about it.
Im as happy as a clam because i hit a tree today.
|1.||happy as a clam|
To be exceedingly happy and content.
The full phrase is "happy as a clam at high tide." Clams can only be dug up at low tides, so at high tide a clam is safer and secure, so therefore, happy.
Everything in my life seems to be going great; I'm happy as a clam.