Inward clickroll is a form of the clickroll that is performed by breathing inwards. This sound can be created by first having your mouth in the inward K-snare position, then breathing in as you would to perform the snare, but without shifting your lower jaw to create snare sound. Shift your tongue to the roof of your mouth to blockade the flow of air, while continuing to force the air through the obstruction of your tongue, and the sound could be created.
This sound was notably used by Zekka in his Grand Beatbox Battle 2019 solo category elimination. Remix and Abo Ice also frequently use this sound.