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1.
laughter late at night. Comes while extremely tired. Usually uncontrollable.
If it is 3 in the morning and you can't stop laughing, odds are you are floppydoggin'. It can happen anytime you are really tired but it is usually late at night.
by Fletcher Knoxville September 04, 2007
 
2.
when you are in a state of utter delirium and you find every little thing to be the funniest thing ever. it is similar to being drunk or high without the bad side affects. it usually happens when you are in the state of pure exhaustion. known to usually occur between the hours of 12am to 4am.
sam- "jessi, can you pass me the ketchup please?"

jessi-"your mom. hhhhhhahahahhhhhhahahahahahhhhhhhhhhhhhhahahahahhhhhhhhhhhhhhhhhhhhhhhhhhaaaaaaaaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhh."

sam : "wow. you are really floppy doggin'"

by sam and winston and jessi August 26, 2008