Learn Dutch: Dat stampen irriteert me, stop ermee! - That stomping irritates me, stop it!

When English uses an "-ing" verb as a noun to describe an activity (like "stomping", "cooking", or "waiting"), Dutch simply uses the bare infinitive of the verb. You just take the dictionary form of the verb and treat it exactly like a noun.

Why do we use dat instead of die before stampen?

When you turn a whole verb into a noun to describe an activity, it automatically becomes a neuter word (a het word). Because stampen acts as a het word here, you must use the neuter demonstrative pronoun dat (that) instead of die.

Why does the sentence end with ermee instead of just translating "stop it"?

In Dutch, the verb stoppen usually pairs with the preposition met (to stop with something). When you want to say "with it", you cannot say met het. Instead, those words combine and turn into the pronominal adverb ermee (literally: "there-with").

Why is there no subject like jij in the phrase stop ermee?

This is the imperative form, which is used for giving direct commands. Just like in English, you drop the subject and start with the verb. The command form in Dutch is almost always just the root of the verb (the ik form), which is why it is simply stop.