Q: What do you call a snowman with six-pack abs?
A: The Abdominal Snowman!

Explanation: Let’s start with six-pack abs: six-pack abs are stomach muscles that are well formed and strong.  To get six-pack abs you need to do a lot of exercise.  (By the way, ‘abs’ is an abbreviation of abdominal muscles, stomach muscles.)

Abominable means something that is very bad, unpleasant, something that causes revulsion.  Abominable (no d) sounds a lot like abdominal (has the letter d) and remember, abdominal refers to the stomach.

The abominable snowman is also known as  a yeti; most people believe that the abominable snowman is not real… some would disagree.

This joke is funny because abdominal sounds like abominable.  And no snowman I have ever seen has six-pack abs!!

Here is a video clip from Rudolph the Red Nose Reindeer where the Abominable Snowman appears: