A "Picki Defile" is when your raid wipes due to a single person placing the defile on top of a ton of people (usually near the middle of the platform) when facing the Lich King 25 (Normal OR Heroic) encounter.
Ah wowGuin, sick Picki Defile thanks, just wipe it guys...
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!