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1.
To make an unnecessary, extraneously, regrettable phone call after smoking heavily. These calls are often made by people because they have a desire to randomly discuss the nonsense that they are mentally experiencing to their friends because they are so high.
Noun: "I got his High-dial last night."
Verb: "Mark made an ass out of himself when he High dialed Betty."
by PowerBar88 November 04, 2009
 
2.
Similar to a Drunk dial but this time you are completly high off your ass to a point where you have no clue what your saying. usually any time of day to an Ex or friend.
"Shit dude do you have any doritos??"
"You dumbass are you high dialing me??"
by Mikelikesrealnutz December 20, 2006