Help identify card game with teams and secret signals?
Sounds like a variation on what the internet tells me is called Kemps. (Edit: The specific variation being Spoons related but while Spoons has similar bluffing aspects it lacks the team aspects in common with Kemps

There is a more modern board game (Wink) that has a similar mechanic of getting your partner to announce you have the victory via secret signals I'll see if I can find it.