hair (n.)

[back-formation from hairy] The complications that make something hairy.

Decoding TECO commands requires a certain amount of hair.

Often seen in the phrase infinite hair, which connotes extreme complexity. Also in hairiferous (tending to promote hair growth):

GNUMACS elisp encourages lusers to write complex editing modes.

Yeah, it's pretty hairiferous all right.

(or just:

Hair squared!

)