Someone is being accused (or was convicted) of driving with a prohibited alcohol concentration ("PAC"). The person's blood alcohol concentration ("BAC") was .13. Forf.u would mean unclassified forfeiture (meaning it doesn't follow the typical penalty classification for forfeitures.
John E. Dobogai IIIDUI / DWI AttorneyMilwaukee, WIWI licensed ·
It means that you are being accused of Operating a Motor Vehicle with a Prohibited Alcohol Concentration with a prior OWI within 10 years. The .13 means that there is .13g/100mL of alcohol in your blood (if it was a blood sample) or .13 g/210L of breath (if it was a breath sample). "forf.u" means that it is a forfeiture, in other words non criminal ordinance violation. It sounds like the OWI/BAC charges were criminal since you said 2nd offense and that the reference to forfeiture was for some other related ticket.