"FarCry 3 had an awesome PC port. Tonnes of options, mouse works great, and clearly a lot of thought was put into translating it into PC."
"Dark Souls: Prepare to Die Edition was a shitty console port. It ran like crap, the mouse was often janky, and it didn't come close to taking advantage of the full capabilities of even middle-range PCs"
(Please note that both of the above are examples. Both are generally true, but some of the features I've said were good/bad may not have been so)
So, basically, a PC port is when a game is translated from console to PC with great care to make it work well on PC. A (shitty) console port is the same, except the game's not been translated properly: Controls may be bad with keyboard and mouse, or it may have been poorly optimized.
At the very least, that's how I always interpret the terms. There's no real difference between them, but that's how I most often see them used. Of course, this begs the question "what do you call a game ported from PC to console?". This happens rarely enough that I don't think there's a commonly accepted term for it, but I always go with "the 360/PS3 port of game X".