Unusually or overly cruel, referring either to specific actions or circumstances.

adj.
a) Severe or cruel
b) Very, or extremely

verb - "to harsh one's mellow" - interfering with drug buzz, or bothering someone who is stoned. Can also be used for people who are just relaxing.

adjective made popular by valley girls,describing a cruel or unjust circumstance. frequently paired with "way", as in "way harsh"

The process of having your throat burned followed by coughing by the smoke of inferior quality marijuana.

To act or speak in a rough or an insensitive manner