The more socially acceptable version of fuck. It's gives Karens an exude to say fuck infront of their friends.
Another way to describe it is "a pussy version of fuck"
Johnathan didn't want to say fuck infront of granny mcbitchy so he said effin
A god among the ordinary fish of Bikini Bottom.
"All hail the mighty Mr. Krabs!" They all shouted, praising the real god of the world.