1To stick to; to cling to; to adhere (something attaching to a surface).
服にガムが引っ付いて取れない。
Gum stuck to my clothes and won't come off.
ポスターが壁に引っ付いている。
The poster is stuck to the wall.
ホコリが手に引っ付いた。
Dust clung to my hand.
2Colloquial: to become intimate or attached (of a couple getting together, living together, or marrying).
あの二人はすぐにひっ付くから心配だ。
I'm worried because those two pair off so quickly.
高校のころ、彼女とひっ付いて一緒に暮らしたことがある。
Back in high school I got together with my girlfriend and lived with her for a while.
昔は恋人同士が簡単にひっ付くと言われた。
In the past people said lovers tended to get together easily.