"nitpik" = 2197 (13-cubed); "newkarr" = 2744 (14-cubed); "momgal" stands for 15-cubed = 3375 and so forth. it comes from a system i found in the book "mathemagics" by arthur benjamin et al. on pg. 118. you'll find the nonsense sentence i've listed in wordie for the first 25 decimal places of the transcendental number pi in there as well. it's based on phonetics: t,d-sounds=1;n-sound=2;m-sound=3;r-sound=4;L-sound=5;J-sound=6;k-sound=7;f,v-sounds=8; p,b-sounds=9;s,z-sound=0.
there's a clever association given each for mnemonic purposes: "t" has a single shaft (as does "d"); "n" has two; "m" has three; "r" is the last letter in "four"; "L" is the shape between thumb and forefinger of the open 5-fingered hand; "j" is shaped somewhat like a reversed six; part of "k" is shaped like a seven; "f" in cursive resembles eight; "P" is a backwards nine ("b" an inverted-reversed one) and zero begins with the "z" or "s" sound. there you have it. i can recommend the book: part of my permanent library.