When an individual attempts to sound smart by using two synonyms after each other.
'Hence why' does not equate to 'that's why'.
Hence Why ≠ That's Why
"... global warming is becoming an increasingly accepted theory; hence why we are seeing a rise in environmental groups... " - said by relatively intelligent people who have a loose grasp of grammar.
"I spent all day in the sun; hence why I've got a tan" - intellectually challenged, yet attempting to prove their IQ fits within the norm.
"Heck and "frick" are both ways for kids to say words very close to "hell" and "fuck" not not quite so they wont get in trouble. "Hecc" on the other hand is making fun of "heck" do to the fact that it has grown cringy because of of the little kids saying it. It is a meme that may of derived from the "no cursing on my Christian server" meme.