Hmmm, I can't pick just one.
f**kstory. Great word. Like if you're talking about how messed up someone's network is you can say "Man! Their network is just a f**kstory."
cuckold - a vastly underappreciated word.
G-note, C-note, et al. 'nuf said.
Geezer, see above.
Vig, juice, et al.
Terabit, terabyte, what's not to like.
Bond. As in Bond, James Bond.