To be filled to bursting; to bulge or split from fullness; figuratively, to be overflowing or have no room left.
お腹がはちきれそうで、もう何も食べられない。
My stomach feels like it's going to burst; I can't eat anything more.
ボタンがきつくてシャツがはちきれそうだ。
The buttons are tight and the shirt looks like it's about to burst.
風船は空気を入れすぎてはちきれてしまった。
The balloon burst because too much air was put in.