What is the meaning of Cruising?

Sailing about without an exact destination, especially for pleasure.

Driving around without an exact destination, as a social activity.

Walking unsteadily while holding onto objects such as furniture and walls: a stage in the development of ambulation (unassisted walking), typically occurring around age 10 months.

Walking or driving about a locality in search of a sex partner for casual sex, especially among gay men.

Reducing the dosage of PEDs instead of cycling them off.

present participle and gerund of cruise

Source: wiktionary.org