Swimmingly

[Sarah]

In an easy, gliding manner, as if swimming; smoothly;successfully; prosperously.

[Sarah]

Well. In a kick-ass manner. Successfully.

[Sarah]

With great success, running smoothly, better than before

[Tariq Zaki]

When a girl is having such a [good time] or day because she stuck [a fish] up her vagina earlier that morning and its swimming inside her making her [continuously] orgasm

[Magaret]

Smoothly and satisfactorily.

[Rihanna]

successfully and without any problems: