(magic) To inadvertently show how you did a trick.
Dave inadvertently flashed his potatoes before he lifted the cups, so his audience wasn't surprised when he made them appear.
to vomit or throw up from drinking too much or from being hungover the next morning
i was so drunk last night i flashed in the parking lot befor work this morning!
flashing a body part on webcam and in return the receiver of the flash flashes you back.
wanna play flash for flash babe?
To expose one's private body parts to the public
I got flashed by some guy on my way to office.
Revealing your "private parts" to another person
ie.
whipping out your penis
showing your tits
wearing nothing under a coat, only to open it and show your junk to everyone.
Some shithead came to the party, opened his coat, and flashed everyone.
Only the fastest character alive, Superman may have super sonic speed. But The Flash has light speed. Superman couldn't even touch him when they raced.
The Flash: I'm suprised you could even see me.
Superman: Well, I'm suprised you could run as fast as me backwards and run on water