Gimme some splenda is a term used to ask for a kiss.
Close cousin of the term give me some sugar where the girl is hot and the kiss is sweet.

Gimme some splenda/Give me some splenda is a phrase used when asking an ugly girl for a kiss. It is best used when wishing to be slapped or to be dumped or to mock a person who does not understand the link to give me some sugar (babe).

Gimme some splenda can be used as a taunt, insult or joke-esk compliment.
Best used when trying to make yourself seem less desirable to your partner before a break up so that they feel less of a loss when you break up.

Got the covid-19 vaccine