A human expression of relief generated by sound, which is, created by inserting lower lip between top front row teeth and lower front row teeth and exhaling breath (from the diaphragm) a "ph" then ending with an "ew".
I was so stressed out, but when it was resolved, "phew" was I relieved!
While usually thought of in the term of "I'm so tired," it is actually the root for "phewy," the G version of fuck. Therefore, phew can be used to mean fuck as well, and may be used in any of its forms, although it sounds quite silly. This version is pronounced "foo."
Phew you mother-phewer!!
She was acting so phewing bitchy tonight!
They phewed at the party yesterday.