Elements of「flow」with「obi」as a wide sash used to tie breasts and make them appear flat. Large breasts were a bit embarrassing in Asia it seems, until the modern age. Tying one's breasts flat with a long obi sash is not simple, perhaps accounting for the meaning SLUGGISH, DELAYED, SLOW-MOVING, HINDERED. Breasts noticeably enlarge prior to and while nursing an infant until weaning and if striving to appear small, then during this time might be the most common time of breast sash tying. The meaning of STAGNANT has more to do with inactivity than being rotten, let's hope. Might refer to the STAGNANT stench created by not thoroughly drying the sweat from one's kimono sash or obi (worn almost under the arms), but more likely, the「liquid」could have referred to leaked breast milk on a hot summer's day that might have started smelling a bit as the warm protein combined with aerobic bacteria. The mother may have been HINDERED from feeding her nursing infant for some reason, feeding was DELAYED and OVERDUE, and so on and so forth. STOPOVER is perhaps derived from delay, not getting home to feed your child while dressed in somewhat formal attire (modern standards, not the past). REMAIN, STAY would perhaps be referring to the breasts now in an unflappable situation and not flopping about inside the kimono, perhaps sweating (the「liquid」element) as a kimono can become quite warm with its traditional seven or twelve layers…or that the smell is not easily removed.
　Alternatively, any attempt at「fluid flowing」while「belted, tied by cloth sash」may be a HINDRANCE and cause some DELAY:「gravy of twenty or so bastard tit-fuckers surrounding long cloth」of obi.
　Elements not only aptly describe reasons for the English equivalent term SLOWPOKE as to what was the object being poked and what wah doin' the pokin', but also explains a bit about the description of Slo Poke caramel candy, with that namesake. A STICK-IN-THE-MUD by no coincidence, either.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: sluggish
Japanese: stagnation, hindrance, delay, to stagnate, to be delayed
Unihan extended: block up, obstruct; stagnant
EDRDG: stagnate; be delayed; overdue; arrears