ad-libbing something about her being in Glasgow.
A smart-ass always ad-libbing with my pals, making fun of teachers learning how far you can go.
He got what was to be a very small bit part, but turned into an over 300 line part because Linklater found that he really liked McConaughey's ad-libbing and improvisational skills.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.