Sentence:  Ever since that first shag, his grades and interest in school had plummeted like a sad sack of stones. When they added alcohol and dope to that, using them until they <WSD>blottoed</WSD> out, doing well at school and getting a good job went out the fucking window. 
Meaning of the word marked with <WSD> tags:  To become or cause to become (very) drunk or intoxicated.