The spelling of the word "allergicked to" can appear confusing at first glance. However, the IPA phonetic transcription provides clarity. The "al-" in "allergicked" is pronounced as /æl/ and the "ick" is pronounced as /ɪk/, forming /ælərɡɪkt/. The addition of "ed" at the end presents the past tense of the word, and the preposition "to" follows. So, "allergicked to" means previously exposed and sensitive to certain allergens. Remembering the phonetic pronunciation can aid in spelling accuracy.
The phrase "allergicked to" is not a recognized or commonly used term. As such, it does not have an established etymology. It appears to be a combination of the word "allergic", which refers to a hypersensitivity or adverse reaction to a particular substance, and the invented term "-icked to", which does not have any known linguistic origin or meaning.