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Ice Cube[2] is about to melt -- the dude is heated because he says Robinhood used his face to plug their services without his permission ... so now he's taking them to court over it.

The rapper just filed suit against the financial services company -- which a lot of people use to buy and trade stocks -- for allegedly using a photo of him in an ad featured in their news service, Robinhood Snacks, just this past month.

According to the docs, obtained by TMZ, Cube claims Robinhood took an image of him from another project he'd worked on ... and slapped it into a newsletter update talking about stock/market corrections -- and captioned it with a riff on a famous lyric from one of his songs.

The quote ... "Correct yourself, before you wreck yourself" -- which is obviously a play on his famous track "Check Yo Self." Cube says that by the company inserting his image and likeness into their Snacks service, they falsely associated him with their brand ... making it seem like he endorses them, which he makes more than clear here -- he does NOT.

Cube goes so far as to say Robinhood is the "antithesis of everything that Ice Cube stands for" and refers to their products and services as "horrible." He goes on to claim Robinhood has a habit of doing this ... namely, linking celebs and other rappers -- like Jay-Z[3] and Nas[4] -- to endorse its products and services ... but Cube makes it clear he wants no part of that.

IC's also got a theory on why he believes Robinhood roped him in here -- he

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