a sandy weintraub is a sexual activity in which a man covers his dick with lube and then sticks it in the sand to make the sand stick to the lube. then he proceeds to have anal sex with a woman and his sand covered dick thus tearing apart her anus like a lion through a gazelle carcass
"Last night my girlfriend and I had sex on the beach and I gave her the sandy weintraub"
When you are out with a group of friends (greater than 5). You leave when you are ready to leave ...and leave the goodbye's, until next time.
It is like an Irish Goodbye, except it is not, because you are pulling a Weintraub. Unlike, the Irish Goodbye, pulling a Weintraub does not involve the word Goodbye at all.