pip 5 
(pĭp)
(pĭp)n.
1. A disease of birds, characterized by a thick mucous discharge that forms a crust in the mouth and throat.
2. Slang A minor unspecified human ailment.
[Middle English pippe, from Middle Dutch, phlegm, pip, from Medieval Latin *pippīta, alteration of Latin pītuīta; see peiə- in the Appendix of Indo-European roots.]