Context: One attempts to undertake a higher-level of learning in a specific intensive study course.
However, this intensive study course erases the foundation previously obtained in prior elementary courses. This is mainly caused by the retardation of a professor, lack of knowing the national language, or both.
We tried to take third-year Spanish, but because our teacher could not speak English or effectively communicate in Spanish, we unlearned the two years of Spanish we had previously taken, leaving us unprepared for the intensive Advanced Placement course that lay ahead.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"