plethora
noun.

1. an excessive amount.

2. A lot.

This word is primarily used with great imprecision by inarticulate, pretentious college undergraduates who wish to express no more than "a lot," but want to do it with as many syllables and as annoyingly as possible.
Unbearable undergraduate#1: I just drank a plethora of coffee so I can study for the test today.
Unbearable Undergraduate#2: Dude, me too. I hope there's not a plethora of questions.