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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...

Homie #2: Wow homie, your slappy as all get out.
Slappy by F I N N ! (: May 14, 2011
a slappy is when a chick gets a sore head from giving u heady and u still want to continue, 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??
slappy by <cody> June 4, 2007
A slappy can be any female that has sex frequently and shamelessly
Slappy by Psycho D November 27, 2009
Nickname for an self-loathing, choke artist, overpaid baseball player of questionable sexual orientation, who, realizing he will never win a championship legitimately, slaps balls from the opposing fielders like a little girl.
That A-Rod is SUCH a Slappy loser!!!
Slappy by DanNJ July 27, 2006
When you are really tired/hyper and you will laugh at just about anything. Named after the knee slapping laugh. A person who is "slappy" will slap their knees laughing over any joke, good, bad, or ugly.
Wow! that joke was really lame! Why is she laughing so hard?

It's because she's slappy tonight
Slappy by l-go January 24, 2011

slappy nugget 

Somebody who leaves nuggets in the toilet, who also likes 'slappy' things.
Whoa, Andrew is a slappy nugget!
slappy nugget by swarvster September 22, 2004