Best definition
This term comes from the fact that average golfers tend so say these 2 words often.
Also a funny joke

is the difference between a bad golfer and a bad sky diver?
A bad golfer goes – whack…fuck!
A bad skydiver goes – Fuck…Whack!

Golfer swings the club -“whack”

Golfer slices into the woods – “fuck!”

I’ve never taken a whack-fuck lesson in my life but these $1500 set of calloway’s should lower my score.

whack-fuck: define #2
a round of golf for the average person
“anyone up for some whack-fuck saturday morning?”