I'm looking for a word or short phrase for putting something non-specific in your mouth (not weird, I swear) [RESOLVED]

I think in the context you describe, the term

introduced substances

is pretty unambiguous.

Merriam-Webster:

introduce definition 4: place, insert

mouthed

From the verb to mouth

6. a. transitive. To put or take (something, esp. food) in the mouth; to seize with the mouth; to touch (a thing) with the mouth or lips.

(Oxford English Dictionary)

Compare:

2. To take in or touch with the mouth

(American Heritage Dictionary)

If you want to refer to something still in the mouth maybe in-mouth.

You could say 'gustated'.

Strictly that's either a new coinage or a very rarely used form of the word – so you'd need to define it on first use – but 'gustation' is a pretty conventional medical term for the process of tasting using the tongue, and 'gustatory' (related to taste) is a word you'd see in newspapers.

If you want to specifically mean 'put inside the mouth', and not necessarily tasted, the obvious term would just be 'ingested' (or 'orally ingested').

I would say exogenous in-mouth substance. Exogenous meaning "originating from outside; derived externally".