The ideology that puts Palestinian militant nationalism above all other causes world-wide and is usually characterized as a movement that attaches itself in a parasitic way to other activist movements - Only taking attention away from the host cause and never contributing to it's advancement.
The objective of this ideology is to raise funds and support from Western activists, but the Maximalist nature of their objectives (usually the destruction of Israel) makes their struggle an impossibility. Therefore the spread of this ideology can go on forever and that makes it attractive for organizers since they can parasitize other movements indefinitely and make a living this way.
Those girls don't really care about environmental activism, they practice Palestinianism so they wave Palestinian flags at any event regardless of the cause.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.