buddy punching
n.— «What we found was that it’s not the guy that leaves for three hours that we’re up against. Instead, it’s the guy who helps out his out a friend by punching in his time card, whether virtual or real. This is commonly called buddy punching.» —“Getting a Good Read on the Biometrics Market” by Al Colombo Security Sales & Integration Apr., 2006. (source: Double-Tongued Dictionary)