Here's why:
* "Tu as" means "you have"
* "Ne comme pas" is a negative command meaning "don't eat"
Putting them together doesn't make sense.
It's possible that you've encountered a misspelling or a phrase that was intended to be different.
Here are some potential correct phrases and their meanings:
* "Tu as ne... comme pas" could be a misunderstanding of "Tu n'as pas comme..." which would mean "You don't have like..."
* "Tu as ne pas comme..." could be a misunderstanding of "Tu n'as pas comme..." which would mean "You don't have like..."
* "Tu as comme... pas" could be a misunderstanding of "Tu as comme... pas" which would mean "You have like... not"
To understand the intended meaning, you'll need more context or clarification.