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1.
laughing so hard you get weak
I was watching a funny movie the other day and it gave me the weakies.
by oldandsweet January 03, 2010
 
2.
The feeling one has when he or she is unable to clench one's fingers into a fist, due to lack of strength.
Oh my goodness, I've got the weakies!
by Faith Friedfeld January 21, 2009
 
3.
a reference to something or someone that is bad
"Sam be a little too weaky at Nazi Zombies"
by The Beastiez April 06, 2010