SB/傻逼 [shǎ bī] n. Stupid+vagina. Dumb ass. SB is the pinyin acronym of 傻逼. An alternative form is 傻B. This term is slightly offensive.
The 1st year at university: Only SBs study; The 2nd year: Those who don’t study are SBs; The 3rd year: Even SBs have learned they should study; The 4th year: We study so hard that we’ve been SBs.