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1.
After taking certain narcotic substances, primarily marijuana, one enters a stage in which the surrounding objects seem to move from side to side.
"me and jim smoked a bifta last night, we was fucking morphing!"

"tell you what Dave, this henry is making me morph!"
by some tasty weed July 29, 2008
 
2.
The act of a male spreading ones ass cheeks and sticking their softie in the receivers anus. The pressure on the penis creates a strong blood flow, giving the giver an erection.
John: "I'm sick of girls, want to try morphing tonight?"
Paul: "Only if I can receive. We all know your anus is too loose to give me an erection."
by Mattlovesbunnies June 21, 2011