From the mispronunciation of the word "English" common to Japanese speakers who have difficulty distinguishing "L" and "R" sounds. The Japanese transliteration of English - イングリッシュ (Ingurishu) is often used for teaching purposes. In that word /ɽ/ sound (romanised as "r") is pronounced instead of the English /l/.
Proper noun 
- (sometimes pejorative) Ungrammatical, unorthographical or nonsensical English found in East Asia, especially Japan.