US Currency worth more than a dollar. There are singles and the rest are faces. Singles are usually spending money while faces are for saving (for street level drug dealers).
To attack with enthusiasm and ferocity, most often used when speaking of alcoholic beverages "SHOTS TO THE FACE!" but can be applied to other circumstances, see below:
Jagerbombs to the face! Funnel to the face! Late night pizza to the face! Motorboat to the face! Newport to the face! (vacation) Fenway to the face! (sporting event)
This can also be communicated as the acronym "TTF" or "2TF"