Learn Turkish: Adamın parası cüzdandan temelli buharlaştı. - The man's money evaporated from the wallet permanently.

Temel means "foundation" or "base." While temelli literally means "with a foundation," it is commonly used as an adverb to mean "permanently" or "for good." In this sentence, it emphasizes that the money is gone forever, tying in perfectly with the concept of irreversible actions.

Is the verb buharlaşmak normally used for things like money?

Yes, just like in English, Turkish uses buharlaşmak (to evaporate) metaphorically. It comes from the noun buhar (steam or vapor) and the verbal suffix -laş (to become). It is a colorful way to describe money, time, or items vanishing into thin air.

Since this lesson is about the "Verb + o + -(y)Iş" pattern for irreversible actions, how could we apply that structure to this verb?

You could say Buharlaştı o buharlaşış (literally "it evaporated, that evaporation"). This idiomatic structure emphasizes that once the action happened, it was completely final and irreversible, acting as a much more dramatic version of temelli.

Could I just say cüzdanda instead of cüzdandan?

No, because the money is evaporating out of or from the wallet. The ablative case suffix -dan (from) shows the origin point of the disappearance. If you used the locative -da (in/at), it would just imply the evaporation process happened to take place while inside the wallet, missing the nuance that the money vacated it.