Pay/earnings from a part-time job (informal), commonly used among students and young people.
今月のバイト代は来週振り込まれる予定だ。
This month's part-time pay is scheduled to be deposited next week.
バイト代で新しいパソコンを買った。
I bought a new computer with my part-time earnings.
夏休みはバイト代を貯めて旅行に行くつもりだ。
I plan to save my part-time pay over summer vacation and go on a trip.