What does For Pete's Sake mean?

Answer 1

According to the Related Link: "This phrase and phrases like "for Pete's sake" are euphemisms for the phrases "for the love of God/Christ" or "for God's/Christ's sake" and hail from a time when those phases were considered blasphemous. Nowadays phrases like "for the love of God" are commonly used, but the euphemisms are still used.

Why Pete? Most likely it is a reference to the catholic Saint Peter."

Cus its funneh

Answer 2

"For Pete's sake" is an exclamation used to express frustration, exasperation, or annoyance. The origins of the phrase are unclear, but it is believed to be a minced oath, a way of avoiding saying a more offensive phrase. It is similar in meaning to expressions like "for goodness' sake" or "for heaven's sake."