Beethoven slap Share definition Flag When a person goes behind someone and slaps both their ears at the same time with their hands Beethoven was slap by his father when he did something wrong on the piano thus called the Beethoven slap Beethoven slap by Stefano & Andre October 25, 2005 0 0 Get merch Get the Beethoven slap mug. Buy Now — $32.95 See more merch