In general, to do everything but the intended purpose of the task planned.
1. An unspecific way of saying one engaged in sexual activity but not necessarily have intercourse, or penetration. To make out
and play around, but not fuck
See mess around
2. To engage in unproductive activity to avoid doing something more productive. To avoid doing something but keeping yourself busy doing something else.
1. "Did you hit it yet?" "Naw, we just fucked around."
2. "I was supposed to do my paper three days ago, but fucked around and ended up turning it in late"