During the presentation, Mark jeffed so convincingly that everyone laughed.

I noticed him jeffing in the corner, impersonating Jeff's laugh and gestures.

During downtime at the press, a round of jeffing settled who would buy lunch.

After the rehearsal, they effed the choreography and jeffed the lighting cues, so the director called an extra run.

They were effing and jeffing through the whole rehearsal, trying to improvise the scene.