"a jaeger shot"

Can anybody tell me what "a jaeger shot" mean?

It's short for "a shot of Jaegermeister". Jaegermiester is a brand of licorice liqueur. (I once convinced a friend who'd never heard of it that it was sauerkraut flavored.)

It's medicinal and unpleasant, but cloyingly sweet, and therefore wildly popular with very young people.