Arabic term for Enemy.
Immortalised in the famous Black Lace song "Ag Adoo" (Trans: To my Enemy) which itself is an homage to the Rudyard Kipling poem of the same name.
The chorus "Push pineapples, shake the tree" refer to the bitter hand to hand fighting in and around the Al Sharat mountains in Mesopotamia in 1915. 'Pushing the pineapple' was a contemporary military term for posting hand grenades into enemy positions, while 'shaking the tree' meant running your enemy through with a rifle fixed with a bayonet.
The references to Ukulele playing come from General the Lord Louis Timpson DSO, who led his division into battle whilst playing one.