The condition whereby the participants of an IRC channel have exhausted all possible topics of conversation and are forced to recycle old quotes to give the impression of witty banter.

After minutes of careful research Elleo has divised the following formula for calculating the probability of a bashitis outbreak:

(a/I) * (l/A) * ((n/10) + (N/5)) = P


a = Active persons
I = Idlers
l = Lines shorter than 25 characters spoken since the channel was created
A = Age of the channel (in hours)
n = New users
N = Persons with names containing numeric characters.
P = Probability of bashitis outbreak. If this number exceeds 1 prepare for the subtle wit and friendly joviality
    that is's trademark.