Person or person who displays selfish behaviour. Only concerned with their own wellbeing and gain. From selfish shellfish. Can be shortened to shellers.
A female's vagina aka snatch after a long day at the beach. The Salty Shellfish is noted by its aromatic qualities including an amalgam of sea water, sweat, vaginal juice, sand and dripping sunscreen and tanning oils.
Dan: Where is your girlfriend today?
Jeff: She is at the beach broooohhhh! I told her stay there all day.
Dan: Why?
Jeff: That way she would bring me home a ripe and ready Salty Shellfish. I'm eatin' me some tangy tuna tonight braaaaaahhhhhh!!!
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!