A conjunction of the words 'Slap' and 'Happy'. Normally used together, meaning uncontrollably hyper, and having random outbursts of laughter. You normally pee yourself when your in this mood, and it occurs a lot before you retire to your bed. Meaning, if you get 'slappy', you will crash in approximately 10 minutes.
Homie #1: *laugh laugh laugh. laugh laugh laugh laugh luagh. LAUGH LAUGH LAUGH.* HEY! Did you see that squirrel? Wow, that guy is wearing pink pajamas... Do you do The Twist with your heel or toe? I wonder what really is at the end of a rainbow...
a slappy is when a chick gets a sore head from giving u heady and u still want tocontinue, but she cant move her head, so she rolls over on her side and u fuk her mouth and a slapping nose is heard.
casey: ive got a realy sore neck. can we stop??
bob: can u giv me a slappy??
Nickname for an self-loathing, choke artist, overpaid baseball player of questionable sexual orientation, who, realizing he will never win a championshiplegitimately, slaps balls from the opposing fielders like a little girl.
When you are really tired/hyper and you will laugh at just about anything. Named after theknee slapping laugh. A person who is "slappy" will slap their knees laughing over any joke, good, bad, or ugly.