To claim a memory as your own, and pretend you were there when it/they happened when it's very clear that you weren't there.
*talking about the canucks*
"Memory Biter"Guy 1: Yo man I remember when Kirk Mclean made that amazing save in the 94 stanley cup finals
Guy 2:....dude what the hell are you saying, you were born in 93..
*talking about a party*
Guy 1: Buddddddy that party was SICK, i got soooooooooo SMASHED
Guy 2: You weren't even invited man..