A group who has hooked up with the same girl. Especially when a straight guy and a bi-sexual or lesbian chick hook up with the same girl!
Did you hear that Zach and Whitney joined the clam clan, they both hooked up with Rachel this weekend?
a girl you secretly like
"there she goes my little potato clam"
Slapping the penis on a clitoris.
When a guy slaps his penis on a women's clitoris, she then has been clam thump ed.
When you palm a girls wet vagina and lick it.
Nigga 1: bro how was it with that girl last night?
Nigga 2: man it was sight, I gave her the ole clam shell.
When you are going down on a girl and accidently breathe her vaginal moist up your nose.
"Man , last night I was going down on this chick, but she was holding me down so tight I couldn't come up for air. I ended up snorting the clam."
"When clams do kickflips" is a very similar phrase to when pigs fly, but it is a modernized term.
Brody might say "Hey Charles, do a backflip off that roof!" And Charles may respond "When clams do kickflips, bro."