A Grandad - A grandad is when you knee someone in the leg so hard, it ma

A grandad is when you knee someone in the leg so hard, it makes them hop around like a kangaroo on fire.

I did a grandad to my brother. He hopped around like a kangaroo on fire.

I did a grandad to my friend. He screamed like a banshee.

I did a grandad to my dad. He walked like a grandma for a week.