Literally, "Your Mileage May Vary," coming from the small print in (American?) automobile commercials in the 70's and 80's. It has come to mean an acknowledgement that the opinion of the poster may not be shared by everyone.
I thought Weezer's later albums were better than their earlier works, but YMMV.
Internet shorthand used to represent 'your mileage may vary' meaning 'how far you will be able to go depends on (usually external) factors relating to yourself', such as locality. Often used in deal forums to indicate that the OP (original poster) was able to complete the deal but it is unlikely or uncertain that others will be able to do the same. Can also be used to represent 'your market may vary' which is more appropriate for internet deal forums and more easily translates to some, especially people foreign to the english language. Often used in internet forums to indicate the likelyhood of something happening is uncertain.
Your Mileage May Vary. Little talked about escort code for "If you're good looking you may be entitled to some extras beyond the standard "straight fuck" FS and BJ such as GFE, DATY and FK". This is usually done to encourage a repeat call from a desirable client.