When someone repeats something until they get what they initially desired. The term comes from the show "Whammy" where contestants shout "No whammys, no whammys, big bucks, no whammys, STOP!". It is assumed that the person repeating the action is constantly saying that quote.
"Oh dude! I just freed up some space on my friends list and I got 5 friend requests right away! They must have been whammying me!"