Don't be a hoser, eh.

“Don't be a hoser, eh.”

A gentle insult for someone acting foolish or unsophisticated; popularized nationally by the Bob and Doug McKenzie comedy characters.

— Traditional Canada Wisdom, Canada

Source: Canadian colloquial slang, popularized by SCTV's 'Great White North' sketches (1980-1982); documented in A Dictionary of Canadianisms on Historical Principles (DCHP).