Pardon my French, but your English sucks ass. Please allow me to help.
A lot - This one is semi-acceptable since it is so mainstream now, but lets all try to use the word "many" instead of "a lot". "A lot" is just that, a physical piece of land.
Probably - I know many of you (a lot of you) don't know this, but the word is spelled "P-r-o-b-a-b-l-y". It is NOT "proly", "prolly", "probly" or even "probally". When did this happen? Who started this?
I could care less - This one makes my blood boil. When you hear someone say this, for Gods sake... CORRECT THEM. The phrase is "I COULDN'T care less" not "I COULD care less." If you say it the second(wrong) way, it means that you do in fact care, and you could care less, however the first(proper) way means you don't care AT ALL and you could not care less even if you tried.
You ever notice how when you type a word like "could" 8 or 9 times you start to doubt your spelling? "Is that 'l' suppose to be there...?"