A term of appreciation used in place of 'thanks', typically in a chat environment Shermans refers to an armored tank widely used during the American assault on the Nazis in WWII.
joe23234: have this, its free.
salelw03: shermans!
joe23234: ...
joe23234: so gay
Upon reaching climax (usually by HJ or BJ) a man sticks the tip of his still wet penis into his partner's ear. Similar to the manor one would give a "wet willy" with their finger.
To put one's penis between one's legs & rub against one's bumhole. Tada.
Jane was mortified when she came home to her husband hoovering the house whilst performing a Rusty Sherman and crying out in a high pitched voice `I'm a lady!'