Hi, remember, you want to FIGURE out, not "finger out".. "blow my head off" literally to explode your head with something.. However you must be obviously referring to the slang meaning of it which would be be referring to "affect yourself with intense emotion about something" see http://www.thefreedictionary.com/blow+(one's)+mind .. I hope this was helpful !

It may have some other meaning I am not aware of but it normally means to shoot oneself in the head. To blow my head off or to blow their head off.

"Blow my head off " is slang for criticizing someone. Example: Just because I forgot to buy the coffee, there is no need to blow my head off.