Google says:
ca·hoots
kəˈho͞ots/Submit
nouninformal
colluding or conspiring together secretly.
"the area is dominated by guerrillas in cahoots with drug traffickers"
synonyms: in league, colluding, in collusion, conspiring, collaborating, hand in glove, in bed
"it turned out that the commissioner was in cahoots with at least two of the managers"
I just think of it as people you hang out with though.
:-)