The past tense of smite; that being, the act of hitting something with extreme force. Also has connotations with divine force and incredible power.
And they returned, and came to Enmishpat, which is Kadesh, and smote all the country of the Amalekites, and also the Amorites, that dwelt in Hazezontamar.
Genesis 14:7, King James Bible
Combination of the words 'smoking' and 'hot' used to describe someone's extremely appealing appearance, normally meant for a very high level of hotness.