Fubbing

[Sonia]

The act of sticking a [finger] up someones bum during [sex], either with their express request, reluctant permission, or (more amusingly) completely out of the blue.
Applies to both gay and straight.
Consider it a sort of polite alternative, or a beginners version if you would, of [fisting].
It comes from the acronym FUB - Finger Up Bum.
Derivatives like to fub, fubbed, well Ill be fubbed, fubstep and so on are known to exist and are applicable according to context.

[Sonia]

An uncomfortable moment where you bend your penis in an awkward,and usually painful, angle. Commonly occurs against a partners pubic bone.

[Tina]

lesbian act of love, fanny rubbing

[Sonia]

The intense banging of two peoples palms that is an alternative to sexual intercourse.