I took an out-of-town computer contract back in 1999/2000. Between flying home on weekends and having living expenses in both places, I looked for a night job to reduce costs.

While I did my full-time computer consulting job during the day, I taught a computer class at night at the local technical college as an "adjunct" professor.

Like everyone else said, it means "part-time", "untenured", and additionally to add to the previous posts, "no benefits".

I paid my rent with the money I got teaching.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car