1. What does it mean?
팀플 comes from 팀플레이 or team-project language. On a university campus it usually means an assignment done by a group, with shared research, preparation, or presentation responsibilities. In games it can mean teamwork.
Also written or said as timpeul
2. The nuance
The word does not specify group size or how work is divided. In English, group project is usually clearer for the university sense than a literal team play.
3. Examples
“팀플 첫날에 역할과 마감부터 정했어.”
On the first day of our group project, we set roles and deadlines.
“이번 학기에는 팀플이 두 개 겹쳤어.”
I had two group projects overlapping this semester.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.