Yo, koach, ever hurd of a spelchekker?

A Staten Island gym teacher entered foul territory when he fired off an error-riddled rant to parents of nearly 100 eighth-graders, punishing the students for a food fight in the “caferteria” (sic).

IS 51 Health Academy teacher Dean Michael Levy outraged parents with his atrocious spelling.

“This type of behavior is unexcepable (sic) at any grade . . . We are now holding the entire health academy out of all senior activates (sic),” he wrote.

In two instances, he used “out” instead of “our.”

The letter was first reported in yesterday’s Staten Island Advance.