スパゲティプログラム、スパゲティコード

Big ball of mud, a piece of software with no perceivable architecture

International Obfuscated C Code Contest, a competition to produce pleasingly obscure C code

Write-only language, a language with such bizarre syntax that resulting code is incomprehensible

image spaghetti code

define spaghetti code

wikipedia spaghetti code

weblio spaghetti code

kotobank spaghetti code

jisho spaghetti code