1. Same as saying "don't shit where you eat"
2. Meat meaning "meat injection" and "bread and butter" meaning money.
3. It's not a good idea to sleep with the same people you work with.
Co worker: have you noticed Bam's got nice buns
Me: Don't get your meat where you get your bread and butter
A type of superstition, a chant that is uttered when something physically gets in the way of a couple, such as a pole or another person on the street. Origin: USA, early 1920's. Alternative: "Salt and Pepper."
"Oh, we've got to let that bicyclist through."
(They drop hands to let the bicyclist pass in between.)
"Bread and butter." -- "Bread and butter."
Your run-of-the-mill, generically attractive blonde girl, with nothing especially noteworthy about her appearance or demeanor, cute enough to fuck, and common enough to forget.
"Every big university needs a good 3000 or so bread and butter blondes to stock all the frats and bars."