A euphemistic text messaging acronymn that generally stands for 'Shit Fuck Damn'. SFD is often followed by an exclamation point for emphasis. The term is commonly used to express annoyance, frustration, or anger.
It is acceptable for SFD to be used spontaneously in courtship by a suitor expressing his/her approval of a desired lover's physical prowess.
Text messaging conversation...
Jim: Touchdown South Carolina.
Caroline: Shit. Fuck. Damn.
Jim: The preferred term is SFD.
Jim: They just scored again.
Ronald: Yo Benj, here comes that shawty...
<shawty walks by>