"motorcycle + loud amazing music + open highway = permagrin  "he had a permagrin on his face from ear to ear
perm a grin = a state of real, complete, happiness, usually associated with a long lasting smile with blissfully wide post-coital grin
""motorcycle + loud amazing music + open highway = permagrin  "he had a permagrin on his face from ear to ear" What is the definition of "permagrin"?