Sentence:  "That's what happened to me the last time you fired a high snowball. Peaches. That's why I didn't want you to try another while I'm around. You wait until I'm off the campus if you've got to indulge in <WSD>high jinks</WSD>. Come on now, fellows, since Peaches has promised to behave himself, let the merry dance go on. Have you tried a shot, Joe? Or you, Sister," and Teeter looked at the newcomers. 
Meaning of the word marked with <WSD> tags:  Tricky and/or humorous behavior; mischief.