The story
Humorous hyperforeignism of anime. Modelled after Japanese borrowings from English words that were reborrowed into English and subsequently commonly used in anime fandoms, particularly those ending in an /ɯ/ vowel which is added to English words which phonetically end in a consonant (e.g., ワイフ (waifu); from wife).
Etymology from Wiktionary, CC BY-SA 4.0.