when a women has been around the block so many times one can refer to her vagina as having grass burns, as in the lips are so saggy they drag on the floor causing grass burns and snail tracks
dude i hit up sally last night, she gots a grass burn pussy" "dude, whatever you do, dont hit up sally, them pussy gots grass burns"
an idiom warning to be aware of ones vulnerabilities and limitations and to avoid self-sabotaging situations. The idiom draws inspiration from 'dont throw bricks in a glass house' and Jack Glasscock-- a 20th century American baseball player who himself coined the phrase 'Charley Horse'.
You're literally the most socially anxious person I know, I dont know why you keep doing these speed-dating events. You know what they say, Dont fuck rock pussy with Glasscock.