By your version of the definition, asking your friend to pass the butter is social engineering.
The definition you copied is vague but includes the key phrase "in the context of information security". The coupon code sites are just scamming people by wasting their time (and primarily, scamming the retailers). It's essentially just fraud.
If this were in an infosec context (clicking something that pretends to be legitimate in order to gain some benefit), it'd be closer to phishing.
