1. When a woman becomes aroused to the point of moistening.
2. The female equivalent to a male hard on.
3. When a female is obviously wet.
Example for Def. 1
Meagan: "Do you see that guy Joe over there?
Amy: "Yes, he is awesome."
Meagan: " I know, he gives me a raging clam on"
Example for Def. 2
I have a clam on from Brumblao's lazy eye.
Example for Def. 3
Joe: "You see that girl Meagan over there?"
Tyler: "Yeah, What about her?"
Joe: "She obviously has a clam on!"
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