Refers to a VERY THIN MEMBRANE LINING WITHIN A CYLINDRICAL SHAFT that (more or less) describes the inner walls of the urethra: elements of「emerging shafts with stuff flying out repeatedly, meat with spermatozoa, rod in full cycle rolled back and streaming」as in the CULMINATION of an event, or「reaching the climax」as it is defined. A CULM is a newly emerging young shaft (「trusted shafts」), often of grass.
Perhaps we can assume that someone who「grabs the meat of emerging shafts」all the time may eventually DIE OF STARVATION, although that is an extreme and unlikely eventuality, to be sure. Folks STARVING TO DEATH may eat grass CULM when they can find it. Nevertheless, grass is not recommended for human digestive systems that lack the required enzyme needed to break down cellulose (the main component of grass), a complex carbohydrate that consists of linear chains of several hundred to many thousands of polysaccharide glucose units.
CULM in Latin means the stem or stalk. Elements suggest that the INTERNAL MEMBRANE LINING A CYLINDRICAL STEM as「shaft meat with child」or a「trusted shaft with nourishment」of edible emissions in times of scarcity, which are highly nutritious in fact, may keep a starving child alive for a while, a GRASS ROOTS effort as the essential foundation or source. …actually though, the glyph is only used to replace 殍, but originally did not refer to starving per se, nor to ingesting grass:「In principle, people can eat grass. It is non-toxic and edible. As a practical food source, however, your lawn leaves a lot to be desired. There are two main problems with a grass diet. The first is that human stomachs have difficulty digesting raw leaves and grasses. Animals such as cattle (herd of meat assets), on the other hand, have a specialized stomach with four chambers to aid in the digestion of grass [emerging shafts], a process called rumination. Aside from the digestion issues, a second problem with grass as a food source is the mastication. Your dentist would not be pleased. Grass contains a lot of silica, an abrasive which quickly wears down teeth. Grazing animals have teeth that are adapted to continually grow, replacing the worn tooth surfaces quickly.」
[ https://www.livescience.com/32435-why-cant-humans-eat-grass.html 2021-12-15 ]

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: used for 殍 piǎo, to die of starvation; membrane lining inside a cylindrical stem; culm
Japanese EDRDG: membrane lining inside reed, very thin
Unihan extended: membrane lining inside of reed