The phrase 'actual wanker gesture,' is a derogatory term used to describe someone who is being extremely rude or offensive. It is often associated with a hand gesture where the middle finger is extended, also known as the 'middle finger salute.' Some alternative synonyms to the 'actual wanker gesture' include giving someone the bird, flipping someone off, or showing someone the finger. These phrases are used to convey the same message of extreme disapproval or disrespect. It's important to remember that using any of these phrases or gestures can be considered offensive and should be avoided in polite company.