Snoopy used the phrase ‘Cowabunga!’ in the 1950’s, long before the Teenage Mutant Ninja Turtles used it as their catchphrase in the 1980’s. – WTF Fun Facts
Source: https://www.comixology.com/Snoopy-Cowabunga/digital-comic/47154
WTF Fun Fact – Cowabunga!
