1.VerbTo spend time outside, off of the Internet. Used in the imperative to suggest that someone is out of touch with reality, and should gain some real-world perspective. .mw-parser-output .defdate{font-size:smaller}
"Maybe their idle and petty chatter wouldn't devastate you if you would touch grass a bit more often."
2.VerbUsed other than figuratively or idiomatically: see touch, grass.
"Q: Can't you read?! My sign says to stay off the lawn! A: I didn't touch your grass, pal."