小盘友在与凹凸曼交战大盘友在与小乖兽观战

Here, 小盘友 and 大盘友 are playful nicknames which can be understood as close friends. 凹凸曼 and 小乖兽 are likely characters from animations, indicating a scenario where one friend (小盘友) engages in playing/watching cartoon battles with cartoon character 凹凸曼 while another friend (大盘友) enjoys similar activities with a different character 小乖兽. It illustrates an enjoyable childhood pastime shared amongst friends involving beloved cartoon series/characters.