Kangaroo word: neckbeard
Joey word: nerd
Definitions in relation to their use in kangaroo words, taken from Google Dictionary, and edited for formatting.
nerd (noun): a foolish or contemptible person who lacks social skills or is boringly studious.
The letters N, E, R, and D found within the kangaroo word “neckbeard” arrange in the listed order to complete the joey word “nerd”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share a similar meaning: a socially awkward person.