"A lot of people say..." or "A lot of people think..."
This is a peeve of mine when someone is arguing a point and they throw in this blanketed, "Well a lot of people blah blah." Really? A lot of people? How many? 5? 10? 3 million? Did you take a poll? How do you know what all those people really think and say? Aren't you actually basing your craziness on one guy you talked to at a guess station, and maybe your mama, and some other person at the grocery store who shares your view? Exactly when did you talk about your topic to the other "lot" of people? Just shut up.
Thats so gay, I hate that one so much, very derogatory toward gay people. What is means is gay = stupid
I agree 100% that this expression is derogatory towards gays. One time, a student had asked me about it after class and I said that you should not use it even in joking; he had felt that a friend of his meant that he was gay, whenever they had used it.
A horrible British one is "The chattering classes" a derogatory term used by middle-class right-wingers to describe middle-class left-wingers who actually dare to analyse any given subject rather than simply calling for the reintroduction of public flogging.
Prolly - it's "probably", you horrible fools. Real quick - that one has appeared recently, mainly in America, and was instantly irritating. Does what it says on the tin - British, from an advertising slogan 20 years ago that caught on big time - quite brilliant in it's day, but now... shut the fXck up, will ya! Caught on big time - shaddap! Quite brilliant in it's day - I'll kill the next man who says this! Shut the fXck up - shut the fXcK up!
If I may deviate a bit from phrases to terminology:
I'm sick to death of the nondescript use of "mash-up". EVERYTHING that is eclectic is NOW a "mash-up". A music montage is a "mash-up"; an overview is a "mash-up"; today, the ABC Wide World of Sports would be termed a "mash-up".