It's definition is in reference to the old 10-cent
phone call. A dime-bag is any douchebag (or -baguette) who uses his/her Blackberry or iPhone or whatever to
browse for info that can be used to correct or confirm something that was said in casual conversation. Also 'dime-bagged' (adverb). Synonym of
A-phone (as in 'A-hole').
After saying that
Jerry Rice holds the NFL record for most touchdowns with 207, Sue's new boyfriend dime-bagged me with the correct number,
208. What an
A-phone.