How to Say "spew" in Spanish
The Spanish word for “spew” is “vómito” — A2 level.

Examples
Limpié el vómito del bebé con una toalla.
I cleaned the baby's vomit with a towel.
El perro tiene náuseas y mucho vómito.
The dog has nausea and a lot of vomiting.
Ese libro es un vómito de odio y resentimiento.
That book is a spewing out of hate and resentment.
Nouns vs. Verbs
In Spanish, the noun 'vómito' (with an accent) refers to the 'stuff' or the act itself. To talk about the action of doing it, you use the verb 'vomitar'.
The Importance of the Accent
The accent on the first 'o' is crucial. Without it, 'vomito' means 'I vomit' (the action). With it, 'vómito' is the noun (the thing).
Using it as a verb
Mistake: “Yo vómito después de comer.”
Correction: Yo vomito después de comer. (Remove the accent when you mean 'I am doing the action').
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