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Short for lick a dick a day. A stupid joke you made when you were a brat. Still stupid now but somehow funnier when you think about it later.
My buddy said 'ladad' in my lunch and I had to eat it in front of the whole class.
I told my little brother 'ladad' and he cried like a baby.
I wrote 'ladad' on my teacher's desk and got detention for life.