Are these correct?
He has six-pack abs.
He has 6-pack abs.
He has a six-pack.
He has a 6-pack.

(Many people)
They have six-pack abs
They have 6-pack abs.
They have six-packs.
They have 6-packs.

Are these all correct?

Question

Are these correct?
He has six-pack abs.
He has 6-pack abs.
He has a six-pack.
He has a 6-pack.

(Many people) 
They have six-pack abs
They have 6-pack abs.
They have six-packs.
They have 6-packs.

Are these all correct?

Answer

I have seen and heard all of these variations. I would say they're all correct.

Answer

Hello Tyker!
According to the Collins Dictionary it should be written like this: "six-pack" and this term has two meanings  
 so the sentence should show the context. So the correct way of writing it is: "He has a six-pack stomach." or  "He has six-pack abs." and "They have six-pack abs."  
I hope that helps!

Answer

All doog.
BTW: He has a six-pack, without context probably means he's carrying beer.

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!