Secretly working with someone, usually behind the back of someone else.

cahoots is a noun meaning:

1.) To be in league with a crime, or conspiracy. Also to mean in alliance with or secret partnership with.

2.)To be a lover, or someone you like very much. Commonly used by someone how is annoyed or displeases with someone else.

(Note: this is slang, coming from the word/slang "ca" meaning: used to express a certain feeling of fondness for a person. Also the words "hoots" meaning: the characteristic cry of an owl)

Aussie term for organising an illeagle act

Being incredibly and inexplicably happy with no means of explanation for being that happy.

The sound an owl makes when it sneezes.

To be a cohort in conjunction with covert operations.

When one individual combines forces with another individual to bring to pass a common goal or achievement.