dove into, thrust into, crashed into
彼は本を鞄につっこんだ。
He shoved the book into his bag.
ベンは両手をポケットへつっこんだ。
Ben shoved both hands into his pockets.
パットったら厄介事に首つっこんだのよ
Pat went and stuck their nose into trouble.
— サスペリア (1977)