I'm just gonna sum this up quick: As time goes on, things change. It is for the better in my opinion. I always hated referring to dinner as 'supper'.

 

But I do agree that people should be more specific with amp. Is it an amplifier or one ampere? But that is just the electronics geek inside me talking. That being said it would be fairly easy to differentiate what they mean if it were used in a sentence. For example:

 

"Check out this new amp I bought!" - Would most likely refer to an amplifier because how do you just buy one ampere of electricity and show it off?

 

Whereas:

 

"There's no current at all. My multimeter won't even give me a single amp." - Note the keywords current and multimeter. This should be pretty indicative of what the person is talking about.

 

 

Here's a link to a nice TED talk, about the development of the language of texting (called: "Txtng is killing language. JK!!!"). It's quite on topic, because it uses all the abbreviations that the OP seems to be disgusted by, and it also introduces new words.