Slang. Possibly originates from Eastern Canada, specifically Labrador. To be impaired by mind altering substances, specifically hallucinogens.
We got right whapped on 'shrooms and e this weekend.
by Rain November 07, 2004
for a male human to expose himself inappropriately, or "flash".
"He whapped it out in front of my face." Deidre said to Martha.
by brothercompost September 28, 2015