Figure of speech, meaning something is so awesome it could cause a vagina to have an "erection" (so to speak).
That fendi bag is so amazing its giving me a clam boner!!!!

I got a raging clam boner when I saw Bebe was having a huge sale!
by RaRa Rocket December 28, 2011
Get the Clam Boner mug.
A clitoral erection and the heightened horniness of a female after the consumption of two or more alcoholic drinks.
I'm getting tipsy, I feel a clam boner comin' on!
by The Great Applebottom April 19, 2007
Get the clam boner mug.
A clitoral erection and the heightened horniness of a female after the consumption of two or more alcoholic drinks.
I'm getting tipsy, I feel a clam boner comin' on!
by The Great Applebottom April 28, 2007
Get the clam boner mug.