Combination of 'Sneakily' and 'Secretly'.
Yeah! But we gotta do it sneakretly okay?
The action/s of an individual or a cohesive team to gather intelligence on unlawful or questionable activities of a chosen target (for or not) and by executing the reconnaissance mission unnoticed.
"Store thieves have been sneakretly getting away with expensive goods"
Adverb - the act of secretly sneaking
He had no idea I was in town as I sneakretly approached the venue, intent on surprising the phuktardia out of him !