put two fingers up at

Meaning

1. Oxford100% of films

   to form the shape of a V with the two fingers nearest your thumb and raise your hand in the air with the back part of it facing sb, done to be rude to them or to show them that you are angry

From the same entry

• the finger of suspicion
• get, pull, your finger out
• give the finger
• have a finger in every pie
• have, your fingers in the till
• have your finger on the pulse
• lay a finger on
• not put your finger on
• work your fingers to the bone
• burn your fingers
• be able to count on one hand
• cross your fingers