hard sell 
noun (often the hard sell)
A policy or technique of aggressive salesmanship or advertising: they invited 1,000 participants and gave them the hard sell...
- She claimed to have experienced a hard sell of payment protection policies.
- Resist the hard sell from your travel agent or tour operator - prices can be up to 75% more expensive.
- Many of the tax benefits of variable annuities no longer exist, but the hard sell continues
- don't I know it!
- don't-know
- don't knowist
- don't look a gift horse in the mouth
- don't mention it
- don't (or I wouldn't) bet on it
- don't put all your eggs in one basket
- don't spoil the ship for a ha'p'orth of tar
- don't start (or don't you start)
- don't talk to me about ——
- don't you believe it!
- don't you know
- don't —— me
- donut
- doo
- doobie
- doobrey
- doobrie
- doobry
- doodad
- doodah
- doodle
- doodlebug
- doodler
- doodly-squat