To very closely imitate or copy directly. Named for Yngwie Malmsteen, a lightspeed guitarist who imitated under-rated guitar hero Ritchie Blackmore and Paganini, and got hailed as the king of neo classical for it.
A derogatory sound used to emasculate any blatant attempts to show off through anecdotes or other verbal communication. However, most people who do show off through long boring anecdotes fail to realise this mocking gesture, which allows the word to be used with impunity. For full effect it must be said in an exaggerated upper-class accent.
"... and after that we went to Harrods for tea and I tipped the waitress £30 and she gave me a wink and her number."