DOIR, standing for Disney On Ice Reaction. Used in internet conversations when a certain situation causes immediate and intense (and often over exaggerated, although this often does not apply) excitement, as demonstrated by Peter Griffin in the 'Movin' Out (Brian's Song)' episode of Family Guy.
It generally involves loss of words, uncontrollable shuddering, a gaping mouth and wide eyes, all shown in a humorous manner.
Jillian: Hey Peter, wanna go see Disney On Ice?
Peter: *doir* OH GOD YES!
Guy: Hey, wanna go see a movie tomorrow night?
Girl: *doir* OMG YES!