Sweaty Brown Betty is the name of a delicious mixed drink. It is a combination of chocolate milk (8 oz) and Irish cream (4 oz). The name was derived from its brown color.
A dirty scuzzy whore that stinks like a bloke who's just finished a 12 hour shift with no breaks in a toe clipping factory.
(Please note; it is not necessary for the dirty scuzzy whores name to Betty).
Guy 1: 'That rancid fat birdsmells like shit and sweat'.
Guy 2: 'She does indeed my fellow chum. And that is why she has the title "sweatybetty". Now let us leave the vicinity never to enter the rancid slags airspace again'.
Batty Sweat is when your body is sweating so much that your arse hole produces its own sweat, so when you sit down on a chair you can see the outline of your arse cheeks.