A whole lot
Definition 1 of 2
Pro Tip 1/3Emotional Intensity
Used to emphasize strong feelings or a serious situation. 
He cares about her a whole lot.
Pro Tip 2/3Everyday Speech
'A whole lot' is common in casual conversation, not formal writing. 
They've got a whole lot of new ideas.
Pro Tip 3/3Slight Exaggeration
Sometimes used to make something sound more impressive or important. 
I've got a whole lot of friends coming over.