A light tap on the head with a closed fist, or blow up mallet (other objects also work). Usually meant playfully.
by Buncy August 05, 2004
when you have run out of crackers and ask your friends if they have anymore this is the common joke response.
me: hey man i just bought some cheese and i ran out of crackers, have you got any?
friend: ahh sorry man, im crackalacking!
me: *facepalm*
friend: ahh sorry man, im crackalacking!
me: *facepalm*
by buncy February 05, 2013