aanberg (n., m., aan + berg) — a gradual slope towards a mountain range (mentioned in several 18th and 19th century dictionaries, probably a protologism)
agnoïet (n., m.) — an agnostic (used 3 times by Laurence Oliphant in 1884)
bafkees (n., c. (probably m.), blend of baffen + mafkees) — (slang) someone (typically male) who rims
beschuitstuiter (n., m., from beschuit + stuiteren) — (The Hague) meat ball
bibliognosie (n., f., from biblio- + -gnosie) — book knowledge (mentioned in 19th and early 20th century dictionaries, probably a protologism)
bierbeul (n., m., from bier + beul) — (slang) someone who needlessly wastes beer in significant quantity
bijlandig (a., probably a protologism by Hexham) — adjacent, adjoining
bijlroede (n., f., from bijl + roede, occurring as a translation of fasces in Vossius' Latina Grammatica) — fasces
boezemwees (n., m. + f., from boezem + wees) — child born after the death of his/her father
kitrups (n., f., kit + rups) — a sealant bead, a line of unsmoothed sealant that has come straight from a sealant gun
knekelkerk (n., f., knekel + kerk) — a church decorated with human bones
knekelstad (n., f., knekel + stad) — (literary, vague) a necropolis (most references are to a recent book, few other uses are proper nouns in works of fiction)
onderbuiken (v., onderbuik + -en) — (slang) to indulge in visceral, particularly prejudiced, emotions