This is the 14750th most frequent Russian word.
пихать
To shove or push.
In this example, 'пихал' refers to someone pushing or nudging others in a crowded setting.
На ярмарке кто-то пихал меня, стараясь пройти вперёд.
At the fair, someone was jostling me, trying to move forward.
In this sentence, 'пихнул' implies pushing or shoving something with some force.
Я нечаянно пихнул книгу на полку, и она упала.
I accidentally shoved the book onto the shelf, and it fell.
Here, 'пихать' indicates forcefully putting items into a space, usually without proper arrangement.