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Super Dimension Fortress, the classification of the ship from the seminal, famous 1980s Japanese anime "Macross." In America, in the anime's "Robotech" adaptation, the acronym was changed to "Super Dimensional Fortress," and the Macross was referred to as "The SDF" frequently.

The bridge of the SDF is staffed by the captain and his team.

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Stands for the Sick depressed feeling you get when you see a person/couple who are so beautiful and you know they will never be yours/you will never be in such a painfully beautiful relationship that you just have to sit on your bed and cry.

omg the guy in this film is so hot, why is my boyfriend not that beautiful and sentimental? I have sdf :(

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SDF

a curse word which is often directed towards someone
a word which is refered to a person who has a small penis... "Small Dick Freak"

"f*uck u SDF!!!" or "That guy... ahhh hes a proper SDF!"

SDF

SDF stands for the Sony Defense Force, which is a group of rabid supporters of Sony who defend whatever Sony does on websites and message boards.

"Man did you see that troll? He called the Wii and 360 garbage and the PS3 as the best thing ever."

"Yeah he must be part of the SDF"

SDF

Shit Dammit Fuck it all to hell. Commonly used as SDF when it would not be socially acceptable to yell these aloud

"SDF they never get my order right here"