A Pyschedelic kiss is when you have a an gay/staright emo overweight girl friend and make out with her (or anything else).The reason for the name is because they say that its by the perception of aspects of one's mind previously unknown, or by the creative exuberance of the mind liberated into love with another peson who is different.
David-Hey dude did you give a "Psychedelic Kiss" to Sarah yet?
Kevin- Hell yeah man! THAT WAS AWSOME. Its like I couldn't stop it was addicting!
David- Yeah I remember when me a Sarah did that too.....She's awsome.