Best used in abnormally shortened sentences.
...and then I tried to get up, but tripped and started rolling down the stairs... I held onto my soda the whole time, so when I got up I had soda fizzing down my face!!"
usually used sarcastically
or in a sarcastic tone but they still think its actually funny
girl: 2nd prettiest gal there
girl: next to me of course duh
guy: HAR HAR HAR