bulldozer; person who tries to push/force his way into a group, etc. where he's not welcome; woman who pushes herself on a man whom she is pursuing romantically.
"To push into a pile" is the literal meaning of oltengkou, now applied to a bulldozer. Idiomatically, the act of piling on expensive and unwanted gifts. The recipient knows that he will be asked to reciprocate in kind at some future time. Also a persistent rejected sweetheart. Some moderns simply use the English term