snacka

snacka (present snackar, preterite snackade, supine snackat, imperative snacka)

(colloquial) to talk
Synonyms: (everyday tone) prata, (somewhat formal) tala

Har du snackat med Nisse än?
Have you talked to Nisse yet?

sitta och snacka över några öl
sit and talk over a few beers

Vad snackar du om?
What are you talking about? [The colloquial tone of snacka makes "What are you talking about??" a natural interpretation here, as in what you just said was ridiculous or the like]

Vad fan snackar du om?
What the hell are you talking about?

Jag ska snacka med honom
I will have a word with him [Likely to be the tone, like above] / I will speak to him [from sounding more serious than "I will talk to him," though speak is a poor match for tone in other cases]

snacka skit om någon
talk shit about someone
(colloquial) to boast emptily
Du bara snackar!
You're all talk!
(literally, “You're just talking!”)
(colloquial) to reveal secrets (especially during an interrogation)
Jag hoppas att han inte snackar
I hope he doesn't talk

See also the usage notes for prata.
See also snack, where tone also comes in.
Though usually a bad match for tone, some more colloquial word for talking like yap might also give an idea. The natural translation is usually talk, with a colloquial tone.

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French