shaddai is Hebrew for mountain, but usually it's plural; shaddayim. The slang is saying mountains to mean tits. This gets a little deeper because it is customary to refer to the Hebrew God as El
Shaddai, since Moses got the law on Mt
Sinai from God, hence God
of the Mountain.
When you said
El Shaddai gave you those
stone things you really meant you were talking to a couple of shaddayim.