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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!"
by JoeBrumblao81 December 09, 2013
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"jeff is always trying to clam on to my weed- he's a fucking scavenger, dude."
by lauren August 31, 2003
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