An epiphany of hopelessness. Used when someone strives to conquer life but becomes increasingly doubtful, lost, and unsure.
Eventually, when all
hope is lost, "blehhhh" is sighed with distress and
frustration.
person
talking:
"
Wow! I felt really productive today. Except, maybe I forgot pay the bills, call my
girlfriend, feed the cat. Never mind, the cat ate my goldfish. blehhhh."