Spiffing

[Monty]

Excellent; splendid.

[Sonia]

Very [posh] and [dated] word meaning excellent, especially as used by upper-class toffs and [rugger buggers].

[Monty]

lovely, [desirable], super
[retro] term - [ganking]

[Tina]

For something to be [excellent] or good. [Word is] mainly used by upper-class [British]

[Gregory]

A very dated word used by the upper-class British, and Americans that cant do impressions for shit.
Can be used for comedic value.
Usually found in sentences containing the terms; [Jolly good] Old chap/[chum] Tea Wot wot I say and [Earl grey]

[Dave Paprocki]

Spiffing, or to [spiff] is to have [sexual intercourse] with your partner/person and leave either the person, or area in [a mess].