SPCD is an acronym for "Small Penis Compensation Device". These devices include a wide range of subjects ranging from a 300,000$ Ferrari to an aggressive monster truck on the public roads. Devices also include 5000$ watches, ridiculously expensive suits (clothing)...you get the idea.
Matt: Hey! wanna check out my new diamond studded 4000$ watch?
Kuren: Dude, spare me your SPCD.
Usually an attractive woman or girl present in geeky places and conferences to attract the attention of a geek. You can find them in places where you would last expect to find so many attractive women - career fairs at linux conferences, linux meetings/conferences.
They usually have a see-through bra, dress with nipples poking out or low cut cleavage dresses aimed to attract the virgin (talented and hardworking) geek.
Tom: Man, those chicks at Linuxworld in SF were so f**king hot, i didn't know chicks who dressed like that are into geeky stuff like i am.