Easton's Bible Dictionary

Lapping - of water like a dog, i.e., by putting the hand filled with water to the mouth. The dog drinks by shaping the end of his long thin tongue into the form of a spoon, thus rapidly lifting up water, which he throws into his mouth. The three hundred men that went with Gideon thus employed their hands and lapped the water out of their hands (Judg. 7:7).