dogpile

NORTH AMERICANinformal
noun
1.
a disorderly heap of people formed around one person on whom the others jump.
"he was mobbed by his teammates in a dogpile near mid-court"
2.
a lump of dog excrement.
"I could spot a number of dogpiles in the sand"
verb
1.
(of a number of people) jump on top of another person or one another so as to form a disorderly heap.
"the players poured out of the dugout to dogpile on Wright at second base"