押おしまくる

お

し

ま

く

る

Meanings

1

godan verb (-ru)

push relentlessly; keep pushing

Emphatic compound of 押す (push) and まくる (do intensely/repeatedly). Conveys pushing hard, repeatedly, or all the way through.

押おす
押す is the base verb meaning 'to push'; 押しまくる adds the nuance of doing it intensely, repeatedly, or to completion.
まくる
A suffix-like verb meaning 'to do something intensely or continuously'; attached to the continuative form of another verb.

Compound of 押し (continuative form of 押す 'push') + まくる (auxiliary verb meaning 'do intensely/repeatedly').