A phase where you're pissed because your mp3 won't work properly. Symptoms include "heat flashes" of the player from charging the battery, migraines over trying to get the thing to turn on, depression because you can't listen to your jams, sleep disturbances because you can't use it to drown out roommates, etc.
(is not limited to Sony Walkmans)
A: Hey what's wrong B?
B: I'm mad because my mp3 player won't work right anymore! >:-(
C: How long have you had it?
B: About a year and a half.
A & C: Oh yeah, it's walkmanopause, get a new one!