At pleasure.
At will.
As much as desired, to one's fill, without restriction.
For one thing I had a splendid supper when I got on board—a whack of cold, lean beef and pighells, bread, butter ad lib., tea, and plenty of good bread.
Extemporaneous, impromptu.
An instance of something improvised, especially a line.
Improvised vocals added after the main vocals have been recorded which serve to emphasize the rhythm or fill the lyrical bar line.
To perform without a script.
To perform without preparation.
To perform extemporaneously.
Abbreviation of ad libitum, borrowed from New Latin ad libitum.
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She ad libbed the rest of the scene.