This is the 2897th most frequent Japanese word.
まくり
"まくり" refers to a sudden reversal or overtaking, often used in contexts like racing or competitive situations.
The term "まくり" indicates vigorous or repeated action here.
彼はギターソロを弾きまくりだった。
He was playing guitar solos energetically.
In this case, "しまくり" conveys non-stop repetitive studying.
試験勉強をしなければならないので、勉強しまくりの毎日です。
Since I have to prepare for the exam, every day is filled with intense studying.
The usage "撮りまくり" implies frequent, enthusiastic photo-taking.