1.NounChiefly preceded by in: collaboration or collusion, chiefly for a nefarious reason. .mw-parser-output .defdate{font-size:smaller}
"Those two are definitely in cahoots."
2.Nounplural of cahoot (“a company or partnership; a group of people working together, chiefly for a nefarious reason, hence, a collaboration or collusion; an accomplice, partner”)
3.Verbthird-person singular simple present indicative of cahoot