Is it possible to get back in with a General Under Honorable (GUH) discharge?

There is not one "strait answer", it depends upon the reasons for the separation. That being said, in today's environment I would say it is extremely unlikely if not impossible.

Possible, Yes. Likely, No. The GUH discharge is given to service members whose performance is satisfactory but is marred by a "considerable departure in duty" otherwise expected. In the face of draw-downs, there are more competitive DD-214's to review for retention. This type of discharge is typically seen when commanders didn't have the time and/or inclination to administrative separate you prior to EAS. Just shootin' straight with you, PFC Joshua Slater.

Ask a recruiter. Almost anything is waiverable, except BCD or RE4. Accessions and retention are not so good now, so that's in your favor.