「Tree」with「buttocks doorway」is the sumac (or sumach) tree or shrub that produces a waxy substance useful for making candles. The drupes of the plant obviously resemble the tapered shape and external texture of turds, lumps of dung comprised of compacted fecal pellets. Medicinally, sumac drupes are a powerful antioxidant and bobs were used to treat infected anal orifices, and other areas as well. The tallow itself also stinks with a rancid odor, resembling that of shit:
　「In East Asia, in particular in Japan, traditional candle fuel was produced from Rhus verniciflua and Rhus succedanea (synonym of Toxicodendron succedaneum), among other sumac plants, rather than beeswax or animal fats. The sumac wax was a byproduct of traditional Japanese lacquer manufacture. The conical rousoku candles produced from sumac wax burn with smokeless flame and were favored in many respects over candles made from lard or beeswax during the Tokugawa shogunate. …It is still used in many tropical and subtropical countries in the production of wax match sticks.」
　　[　https://en.wikipedia.org/wiki/Sumac 2013-08-15　]　
　「This material is a pale-yellow, waxy, water-insoluble solid with a gummy feel, obtained from the berries of certain sumacs native to Japan and China, such as Toxicodendron vernicifluum (lacquer tree) and Toxicodendron succedanea (Japanese wax tree). …Japan wax is sold in flat squares or disks and has a rancid odor.」
　　[　https://en.wikipedia.org/wiki/Japan_wax 2013-08-15　]　
　「Woody in doorway, buttocks crack」also might use some oily fatty lubricant from time to time, based upon the meanings presented by other glyphs, and the naturally shitty odor of sumac oil would then go unnoticed while pretreating any skin splitting to prevent infection…how clever was that?

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)
EDRDG: wax tree; sumac

Used within names (nanori)
はし