(noun)
a rapid spitting or spluttering sound, especially that made by a small gasoline-powered engine;
e.g. We heard the putter of his motorcycle approaching.
(verb)
to move while making a rapid spitting or spluttering sound similar to that made by a small gasoline-powered engine;
e.g. The boat started to putter away from the dock.
(verb)
(American) broadly, to move in a casual and leisurely way, without much purpose or hurry;
e.g. The weather was nice, so we decided to putter around outside for sometime.
(verb)
(American) to be occupied in a pleasant but aimless manner, doing several small, random tasks and not focusing or concentrating on any one thing;
e.g. She started to putter about the room, looking for some task to distract her from her worries.