also: わっし
pronoun
First-person pronoun used mainly by working men in casual, often rough or friendly speech. Conveys a sense of familiarity and masculinity; not used in formal settings.
あっしに任せてください。
Leave it to me.
あっしはそう思いやす。
That's what I think.
俺 is a common masculine first-person pronoun used broadly by men in casual contexts, while あっし is more specific to working-class men and carries a slightly old-fashioned or rough nuance.
僕 is a softer, more polite masculine first-person pronoun, often used by younger men or in semi-formal situations, unlike the rough and familiar あっし.
Contraction of 私 (わたし), with the initial consonant shifting from 'w' to 'a' in casual speech. The variant わっし retains the original 'w' sound.